Quarterly report pursuant to Section 13 or 15(d)

Debt - Narrative (Details)

v3.19.2
Debt - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
May 23, 2017
USD ($)
$ / shares
shares
Feb. 29, 2016
USD ($)
Jun. 30, 2019
USD ($)
$ / shares
day
Jun. 30, 2019
USD ($)
$ / shares
day
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
May 31, 2017
USD ($)
Sep. 30, 2014
USD ($)
Line of Credit Facility [Line Items]                        
Carrying value   $ 296,923,000         $ 296,923,000 $ 296,923,000        
Ratio of indebtedness   3.75         3.75 3.75        
Covenant, interest coverage ratio   3.00         3.00 3.00        
Convertible notes, net   $ 0         $ 0 $ 0 $ 292,843,000      
Common stock warrants (in shares) | shares         8.2              
Purchases of convertible note hedges         $ 62,500,000              
Proceeds from issuance of warrants         $ 31,500,000              
Warrants strike price (in dollars per share) | $ / shares         $ 57.58              
Maximum                        
Line of Credit Facility [Line Items]                        
Common stock warrants (in shares) | shares         8.2              
Revolving Facility                        
Line of Credit Facility [Line Items]                        
Line of credit facility, additional borrowing capacity   150,000,000.0         150,000,000.0 150,000,000.0        
Revolving line of credit facility, available borrowing capacity   350,000,000.0         350,000,000.0 350,000,000.0 350,000,000      
Unamortized debt issuance costs   $ (1,100,000)         $ (1,100,000) $ (1,100,000) (1,300,000)      
Revolving Facility | Maximum                        
Line of Credit Facility [Line Items]                        
Ratio of indebtedness   3.50         3.50 3.50        
Revolving Facility | LIBOR                        
Line of Credit Facility [Line Items]                        
Basis spread on interest rate               1.00%        
Revolving Facility | LIBOR | Minimum                        
Line of Credit Facility [Line Items]                        
Basis spread on interest rate               1.25%        
Revolving Facility | LIBOR | Maximum                        
Line of Credit Facility [Line Items]                        
Basis spread on interest rate               2.25%        
Revolving Facility | Federal Funds Rate                        
Line of Credit Facility [Line Items]                        
Basis spread on interest rate               0.50%        
Revolving Facility | Base Rate | Minimum                        
Line of Credit Facility [Line Items]                        
Basis spread on interest rate               0.25%        
Revolving Facility | Base Rate | Maximum                        
Line of Credit Facility [Line Items]                        
Basis spread on interest rate               1.25%        
Letters of credit                        
Line of Credit Facility [Line Items]                        
Line of credit facility, maximum borrowing capacity                       $ 350,000,000.0
Sub limit for issuance of letters of credit                       10,000,000.0
Swingline Loan                        
Line of Credit Facility [Line Items]                        
Sub limit for issuance of letters of credit                       $ 20,000,000.0
Convertible Senior Notes                        
Line of Credit Facility [Line Items]                        
Proceeds from borrowings on convertible notes         $ 304,200,000              
Delayed Draw Term Loan                        
Line of Credit Facility [Line Items]                        
Periodic payment     $ 1,500,000     $ 800,000            
Delayed Draw Term Loan | Line of Credit                        
Line of Credit Facility [Line Items]                        
Line of credit facility, maximum borrowing capacity           $ 125,000,000.0            
Delayed Draw Term Loan | Line of Credit | Base Rate                        
Line of Credit Facility [Line Items]                        
Ratio of indebtedness   5.00         5.00 5.00        
Delayed Draw Term Loan | Term Loan                        
Line of Credit Facility [Line Items]                        
Carrying value   $ 184,199,000         $ 184,199,000 $ 184,199,000 189,033,000 $ 200,000,000.0    
Periodic principal payment     $ 2,500,000 $ 1,300,000                
Convertible Senior Notes Due November 2022 | Convertible Senior Notes                        
Line of Credit Facility [Line Items]                        
Principal amount   345,000,000     $ 345,000,000.0   $ 345,000,000 $ 345,000,000 345,000,000      
Interest rate stated percentage         1.50%              
Conversion rate, convertible notes               0.02384        
Conversion price (in dollars per share) | $ / shares         $ 41.95              
Long-term debt fair value   139,000,000.0                    
Threshold trading days | day             20 20        
Threshold consecutive trading days | day             30 30        
Measurement period threshold trading days | day               5        
Measurement period threshold consecutive trading days | day               5        
Redemption price (percentage)               100.00%        
Convertible notes, net                     $ 282,500,000  
Carrying amount of convertible debt equity component   $ 61,390,000         $ 61,390,000 $ 61,390,000 61,390,000   62,500,000  
Debt issuance costs                     $ 9,800,000  
Effective interest rate of the liability component   5.87% 5.87%       5.87% 5.87%        
Convertible Senior Notes Due November 2022 | Convertible Senior Notes | Minimum                        
Line of Credit Facility [Line Items]                        
Threshold percentage of stock price trigger             130.00% 130.00%        
Ratio of trading price per $1000 principle amount               98.00%        
Percentage of debt held by individual owner               25.00%        
Over-Allotment Option | Convertible Senior Notes                        
Line of Credit Facility [Line Items]                        
Principal amount         $ 45,000,000.0              
Scenario, Forecast | Delayed Draw Term Loan                        
Line of Credit Facility [Line Items]                        
Periodic payment $ 3,100,000                      
Scenario, Forecast | Delayed Draw Term Loan | Term Loan                        
Line of Credit Facility [Line Items]                        
Periodic principal payment $ 5,000,000.0                      
Share Price | Convertible Senior Notes Due November 2022 | Convertible Senior Notes                        
Line of Credit Facility [Line Items]                        
Debt instrument measurement input | $ / shares   58.85         58.85 58.85        
Non recurring | Carrying Value                        
Line of Credit Facility [Line Items]                        
Convertible debt fair value   $ 298,900,000         $ 298,900,000 $ 298,900,000        
Level 2 | Term Loan                        
Line of Credit Facility [Line Items]                        
Long-term debt fair value   288,600,000         288,600,000 288,600,000 298,900,000      
Level 2 | Convertible Senior Notes                        
Line of Credit Facility [Line Items]                        
Convertible debt fair value   $ 512,300,000         $ 512,300,000 $ 512,300,000 $ 441,400,000