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Debt and Credit Arrangements - Senior Secured Revolving Credit Facility and Term Loan (Details) - USD ($)
12 Months Ended
Jun. 14, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument        
Financing costs amortization   $ 3,000,000.0 $ 1,300,000 $ 1,300,000
Revolving Credit Facility        
Debt Instrument        
Financing costs amortization   2,000,000.0 $ 600,000 $ 600,000
Revolving Credit Facility | Senior secured revolving credit facility due June 2024        
Debt Instrument        
Maximum borrowing capacity $ 550,000,000.0      
Payments of debt issuance costs   7,500,000    
Unamortized debt issuance costs   $ 9,500,000    
Debt instrument, term   5 years    
Revolving Credit Facility | Term long due June 2024        
Debt Instrument        
Maximum borrowing capacity $ 450,000,000.0      
Debt issuance costs   $ 6,100,000    
Debt instrument, term   5 years    
Revolving Credit Facility | Credit Facilities 2019        
Debt Instrument        
Maximum percentage of capital stock guaranteed by company   65.00%    
Unamortized debt issuance costs   $ 5,500,000    
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Minimum        
Debt Instrument        
Debt instrument variable rate (percent) 1.25%      
Revolving Credit Facility | Credit Facilities 2019 | LIBOR | Maximum        
Debt Instrument        
Debt instrument variable rate (percent) 2.25%      
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Minimum        
Debt Instrument        
Debt instrument variable rate (percent) 0.25%      
Revolving Credit Facility | Credit Facilities 2019 | Adjusted Base Rate | Maximum        
Debt Instrument        
Debt instrument variable rate (percent) 1.25%      
Revolving Credit Facility | Senior secured revolving credit facility due November 2022        
Debt Instrument        
Unamortized debt issuance costs   2,500,000    
Financing costs amortization   $ 200,000