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Debt (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 01, 2021
Jun. 01, 2020
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 14, 2020
May 31, 2017
Debt Instrument [Line Items]                    
Loss on debt extinguishments         $ 0 $ 0 $ (9,173,000) $ 0    
Senior Notes due 2024                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount         $ 375,000,000   $ 375,000,000      
Proceeds from Debt       $ 367,500,000            
Loss on debt extinguishments $ 9,200,000                  
Stated interest rate         5.125%   5.125%     5.875%
Letters of Credit Outstanding, Amount         $ 230,000,000   $ 230,000,000      
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]                    
Line of Credit Facility, Maximum Borrowing Capacity                 $ 300,000,000  
Letters of Credit Outstanding, Amount         $ 35,000,000   $ 35,000,000      
Line of Credit Facility, Increase (Decrease), Net   $ 100,000,000                
Revolving Credit Facility | Line of Credit                    
Debt Instrument [Line Items]                    
Stated interest rate         2.30%   2.30%      
Long-term debt         $ 20,000,000   $ 20,000,000