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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, 2020
Jun. 30, 2019
Debt Instrument        
Payments for debt issuance costs     $ 1,900,000 $ 2,700,000
Revolving Credit Facility | Credit Facilities 2019        
Debt Instrument        
Maximum percentage of capital stock guaranteed by company     65.00%  
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  
Revolving Credit Facility | Term loan        
Debt Instrument        
Principal amount   $ 450,000,000.0    
Debt issuance costs     $ 6,100,000