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Schedule I - Condensed Financial Information Of Registrant (Long-Term Indebtedness) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Apr. 14, 2020
Condensed Financial Statements, Captions [Line Items]        
Unamortized discount - net $ (6,400) $ (6,600)    
Debt Issuance Costs, Net (25,200) (26,000)    
Long-term debt 2,652,186 2,651,185    
Current portion of long-term debt 0 94,907    
Net Long-term Debt 2,652,186 2,556,278    
Loss on early extinguishment of debt 0 2,424 $ 0  
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Unamortized discount - net (527) (625)    
Debt Issuance Costs, Net (7,319) (8,600)    
Long-term debt 872,154 870,775    
Current portion of long-term debt 0 0    
Net Long-term Debt 872,154 870,775    
Loss on early extinguishment of debt 0 2,415 $ 0  
Parent Company [Member] | Bank Term Loan Maturing July 2020 [Member]        
Condensed Financial Statements, Captions [Line Items]        
Long-term debt       $ 65,000
Parent Company [Member] | Three Point Seven Zero Percent Senior Secured Notes [Domain]        
Condensed Financial Statements, Captions [Line Items]        
Long-term debt $ 405,000 405,000    
Debt, stated interest rate 3.70%      
Parent Company [Member] | Four Point Two Five Percent Senior Secured Notes        
Condensed Financial Statements, Captions [Line Items]        
Long-term debt $ 475,000 $ 475,000    
Debt, stated interest rate 4.25%