Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements - Fair Value of Convertible Debt (Details)

v3.8.0.1
Fair Value Measurements - Fair Value of Convertible Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Term Loans | Fair Value | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 303,806 $ 122,532
Term Loans | Carrying Value | Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 317,377 122,126
Revolving Facility | Revolving Facility | Fair Value | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 49,427 0
Revolving Facility | Revolving Facility | Carrying Value | Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 50,000 0
Convertible Notes | Fair Value | Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value 430,301 0
Convertible Notes | Carrying Value | Nonrecurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value $ 281,199 $ 0