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Long-term Debt (Summary of Long-Term Debt) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 3,150,000 $ 3,152,584
Unamortized discount (26,809) (29,181)
Unamortized deferred financing costs (12,272) (13,848)
Long-term debt, net 3,110,919 3,109,555
Current portion of long-term debt 37,500 21,334
Long-term debt $ 3,073,419 3,088,221
4.75% Notes due August 2025    
Debt Instrument [Line Items]    
Interest rate 4.75%  
5.00% Notes due April 2024    
Debt Instrument [Line Items]    
Interest rate 5.00%  
4.75% Notes due December 2022    
Debt Instrument [Line Items]    
Interest rate 4.75%  
Senior Notes | 4.75% Notes due August 2025    
Debt Instrument [Line Items]    
Long-term debt $ 800,000 800,000
Senior Notes | 5.00% Notes due April 2024    
Debt Instrument [Line Items]    
Long-term debt 1,000,000 1,000,000
Senior Notes | 4.75% Notes due December 2022    
Debt Instrument [Line Items]    
Long-term debt 600,000 600,000
Senior Notes | Other debt    
Debt Instrument [Line Items]    
Long-term debt 0 2,584
Secured debt | Term Loan A Facility    
Debt Instrument [Line Items]    
Long-term debt [1] $ 750,000 $ 750,000
[1]
The Company's $500 million revolving credit facility remains undrawn at June 30, 2019. Total undrawn revolver commitments are available to be drawn for general corporate purposes of the Company.