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Debt Senior Unsecured Notes (Details Textual) (Details) - USD ($)
Oct. 04, 2018
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Borrowings under Credit Agreement   $ 100,000,000 $ 440,000,000
Unsecured Debt | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt   $ 1,050,000,000.00  
Unsecured Debt | 2026 Notes Offering      
Debt Instrument [Line Items]      
Stated interest rate   5.875%  
Unsecured Debt | Additional 2026 Notes | Debt Instrument, Redemption, Period One      
Debt Instrument [Line Items]      
Threshold percentage of principle 25.00%    
Default period 30 days    
Period after notice to comply 180 days    
Period after notice to comply with other agreements 60 days    
Maximum aggregate payment defaults and accelerations $ 50,000,000    
Maximum outstanding judgments $ 50,000,000    
Maximum outstanding judgements, payment period 60 days    
Unsecured Debt | Senior Notes Due 2026      
Debt Instrument [Line Items]      
Long-term debt   $ 1,050,000,000.00  
Unsecured Debt | Senior Notes Due 2026 | Debt Instrument, Redemption, Period Two      
Debt Instrument [Line Items]      
Debt redemption price, percentage 104.406%