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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility and Term Loan (Details) - USD ($)
6 Months Ended
Apr. 20, 2020
Jun. 14, 2019
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Debt Instrument          
Payments for debt issuance costs     $ 0 $ 1,900,000  
Revolving Credit Facility | Credit Facilities 2019          
Debt Instrument          
Maximum percentage of capital stock guaranteed by company     65.00%    
Unamortized debt issuance costs     $ 4,300,000   $ 5,000,000.0
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Minimum          
Debt Instrument          
Debt instrument variable interest rate (percent)   0.25%      
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Maximum          
Debt Instrument          
Debt instrument variable interest rate (percent)   1.50%      
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Minimum          
Debt Instrument          
Debt instrument variable interest rate (percent)   1.25%      
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Maximum          
Debt Instrument          
Debt instrument variable interest rate (percent)   2.50%      
Revolving Credit Facility | Senior secured revolving credit facility          
Debt Instrument          
Maximum borrowing capacity   $ 550,000,000.0      
Payments for debt issuance costs $ 1,900,000   11,900,000    
Unamortized debt issuance costs     6,700,000    
Revolving Credit Facility | Term loan          
Debt Instrument          
Principal amount   $ 450,000,000.0      
Debt issuance costs     $ 6,100,000    
Debt issuance cost, amortization term     5 years