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Schedule I - Condensed Financial Information Of Registrant (Long-Term Indebtedness) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Apr. 14, 2020
Condensed Financial Statements, Captions [Line Items]        
Unamortized discount - net $ (6,600) $ (6,500)    
Debt Issuance Costs, Net (26,000) (20,700)    
Long-term debt 2,651,185 2,651,629    
Current portion of long-term debt 94,907 559,199    
Net Long-term Debt 2,556,278 2,092,430    
Loss on early extinguishment of debt 2,424 0 $ 0  
Parent Company [Member]        
Condensed Financial Statements, Captions [Line Items]        
Unamortized discount - net (625) (313)    
Debt Issuance Costs, Net (8,600) (3,959)    
Long-term debt 870,775 870,728    
Current portion of long-term debt 0 469,313    
Net Long-term Debt 870,775 401,415    
Loss on early extinguishment of debt 2,415 0 $ 0  
Parent Company [Member] | Bank Term Loan Maturing July 2020 [Member]        
Condensed Financial Statements, Captions [Line Items]        
Long-term debt 0 65,000   $ 65,000
Parent Company [Member] | 3.45% Senior Secured Notes [Member]        
Condensed Financial Statements, Captions [Line Items]        
Long-term debt $ 0 405,000    
Debt, stated interest rate 3.45%      
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 $ 0    
Debt, stated interest rate 4.25%