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Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Mar. 31, 2021
Mar. 01, 2021
Jun. 01, 2020
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 14, 2020
May 31, 2017
Debt Instrument [Line Items]                
Loss on debt extinguishments         $ (9,173,000) $ 0    
Senior Notes due 2024                
Debt Instrument [Line Items]                
Debt Instrument, Face Amount $ 375,000,000.0     $ 375,000,000.0 $ 375,000,000.0      
Proceeds from Debt       $ 367,500,000        
Loss on debt extinguishments $ 9,200,000              
Stated interest rate 5.125%     5.125% 5.125%     5.875%
Letters of Credit Outstanding, Amount $ 230,000,000.0     $ 230,000,000.0 $ 230,000,000.0      
Debt instrument, redemption price, percentage       105.125%        
Repayments of Senior Debt $ 127,200,000 $ 102,800,000            
Debt Instrument, Redemption Price, Per $1000 Of Principal     $ 1,029.38          
Revolving Credit Facility                
Debt Instrument [Line Items]                
Stated interest rate 2.40%     2.40% 2.40%      
Line of Credit Facility, Maximum Borrowing Capacity             $ 300,000,000.0  
Letters of Credit Outstanding, Amount $ 35,000,000.0     $ 35,000,000.0 $ 35,000,000.0      
Line of Credit Facility, Increase (Decrease), Net   $ 100,000,000.0