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Debt (Schedule of Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Principal amount $ 2,683,348 $ 2,765,949
Less: unamortized costs, net 53,386 26,227
Total debt 2,629,962 2,739,722
Less: current portion long-term debt 62,952 20,108
Long-term debt $ 2,567,010 2,719,614
Notes due | Notes due October 2021    
Debt Instrument [Line Items]    
Interest rate 4.125%  
Principal amount $ 172,456 600,000
Notes due | Notes due May 2022    
Debt Instrument [Line Items]    
Interest rate 4.625%  
Principal amount $ 150,000 400,000
Notes due | Notes due April 2023    
Debt Instrument [Line Items]    
Interest rate 5.20%  
Principal amount $ 275,000 400,000
Notes due | Notes due March 2024    
Debt Instrument [Line Items]    
Interest rate 4.625%  
Principal amount $ 375,000 500,000
Notes due | Notes due January 2037    
Debt Instrument [Line Items]    
Interest rate 5.25%  
Principal amount $ 35,841 35,841
Notes due | Notes due March 2043    
Debt Instrument [Line Items]    
Interest rate 6.70%  
Principal amount $ 425,000 425,000
Notes due | Term loan due November 2024    
Debt Instrument [Line Items]    
Principal amount 395,000 400,000
Notes due | Term loan due January 2025    
Debt Instrument [Line Items]    
Principal amount 850,000 0
Other debt    
Debt Instrument [Line Items]    
Principal amount $ 5,051 $ 5,108