Annual report pursuant to Section 13 and 15(d)

Debt - Line of Credit Narrative (Details)

v3.10.0.1
Debt - Line of Credit Narrative (Details)
12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Feb. 29, 2016
USD ($)
Sep. 30, 2014
USD ($)
Line of Credit Facility [Line Items]              
Consolidated net coverage ratio following permitted acquisition       3.75      
Interest coverage ratio       3.00      
Revolving Facility              
Line of Credit Facility [Line Items]              
Additional borrowing capacity             $ 150,000,000
Outstanding borrowings       $ 0 $ 50,000,000    
Letter of Credit              
Line of Credit Facility [Line Items]              
Aggregate principal amount             350,000,000
Sub limit for issuance of letters of credit             10,000,000
Swingline Loan              
Line of Credit Facility [Line Items]              
Sub limit for issuance of letters of credit             $ 20,000,000
Revolving Facility | Revolving Facility              
Line of Credit Facility [Line Items]              
Available credit       350,000,000      
Delayed Draw Term Loan              
Line of Credit Facility [Line Items]              
Periodic payment   $ 1,500,000 $ 800,000        
Additional borrowing capacity         200,000,000    
Delayed Draw Term Loan | Revolving Facility              
Line of Credit Facility [Line Items]              
Aggregate principal amount           $ 125,000,000  
Delayed Draw Term Loan | Term Loan              
Line of Credit Facility [Line Items]              
Periodic principal payment   $ 2,500,000 $ 1,300,000        
Unamortized discount       $ 606,000 821,000    
Maximum | Revolving Facility              
Line of Credit Facility [Line Items]              
Consolidated net coverage ratio following permitted acquisition       3.50      
Base Rate | Delayed Draw Term Loan | Revolving Facility              
Line of Credit Facility [Line Items]              
Consolidated net coverage ratio following permitted acquisition       5.0      
Base Rate | Minimum | Revolving Facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate       0.25%      
Base Rate | Maximum | Revolving Facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate       1.25%      
Federal Funds Effective Swap Rate | Revolving Facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate       0.50%      
LIBOR | Revolving Facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate       1.00%      
LIBOR | Minimum | Revolving Facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate       1.25%      
LIBOR | Maximum | Revolving Facility              
Line of Credit Facility [Line Items]              
Basis spread on variable rate       2.25%      
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            
Other assets | Revolving Facility | Revolving Facility              
Line of Credit Facility [Line Items]              
Unamortized discount       $ 1,300,000 600,000    
Level 2 | Term Loan              
Line of Credit Facility [Line Items]              
Long-term debt fair value       $ 298,900,000 $ 303,800,000