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Fair Value Measurements - Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Oct. 11, 2018
Fair Value of Financial Instruments      
Less: current portion $ 790 $ 561  
Less: deferred financing costs 33,441 38,325  
Long-term Debt, Excluding Current Maturities, Total $ 3,550,577 3,585,884  
5.00% senior notes due September 2020      
Fair Value of Financial Instruments      
Interest rate on senior notes due (as a percent) 5.00%    
4.625% senior notes due September 2021      
Fair Value of Financial Instruments      
Interest rate on senior notes due (as a percent) 4.625%    
5.50% senior notes due January 2023      
Fair Value of Financial Instruments      
Interest rate on senior notes due (as a percent) 5.50%    
5.10% senior notes due September 2023      
Fair Value of Financial Instruments      
Interest rate on senior notes due (as a percent) 5.10%    
0.75% senior exchangeable notes due January 2024      
Fair Value of Financial Instruments      
Interest rate on senior notes due (as a percent) 0.75%    
5.75% senior notes due February 2025      
Fair Value of Financial Instruments      
Interest rate on senior notes due (as a percent) 5.75%    
2018 Revolving Credit Facility      
Fair Value of Financial Instruments      
Interest rate on senior notes due (as a percent)     5.50%
Fair Value      
Fair Value of Financial Instruments      
Debt $ 3,359,520 3,049,812  
Fair Value | 5.00% senior notes due September 2020      
Fair Value of Financial Instruments      
Debt 310,909 590,336  
Fair Value | 4.625% senior notes due September 2021      
Fair Value of Financial Instruments      
Debt 622,398 603,457  
Fair Value | 5.50% senior notes due January 2023      
Fair Value of Financial Instruments      
Debt 540,688 465,999  
Fair Value | 5.10% senior notes due September 2023      
Fair Value of Financial Instruments      
Debt 298,003 262,494  
Fair Value | 0.75% senior exchangeable notes due January 2024      
Fair Value of Financial Instruments      
Debt 412,563 358,012  
Fair Value | 5.75% senior notes due February 2025      
Fair Value of Financial Instruments      
Debt 694,169 598,953  
Fair Value | 2012 Revolving Credit Facility      
Fair Value of Financial Instruments      
Debt 480,000 170,000  
Fair Value | Other      
Fair Value of Financial Instruments      
Debt 790 561  
Carrying Value      
Fair Value of Financial Instruments      
Debt 3,584,808 3,624,770  
Less: current portion 790 561  
Less: deferred financing costs 33,441 38,325  
Long-term Debt, Excluding Current Maturities, Total 3,550,577 3,585,884  
Carrying Value | 5.00% senior notes due September 2020      
Fair Value of Financial Instruments      
Debt 309,769 614,748  
Carrying Value | 4.625% senior notes due September 2021      
Fair Value of Financial Instruments      
Debt $ 637,468 668,347  
Carrying Value | 5.50% senior notes due January 2023      
Fair Value of Financial Instruments      
Interest rate on senior notes due (as a percent) 5.50%    
Debt $ 577,042 586,000  
Carrying Value | 5.10% senior notes due September 2023      
Fair Value of Financial Instruments      
Debt 336,746 342,923  
Carrying Value | 0.75% senior exchangeable notes due January 2024      
Fair Value of Financial Instruments      
Debt 461,491 450,689  
Carrying Value | 5.75% senior notes due February 2025      
Fair Value of Financial Instruments      
Debt 781,502 791,502  
Carrying Value | 2012 Revolving Credit Facility      
Fair Value of Financial Instruments      
Debt 480,000 170,000  
Carrying Value | Other      
Fair Value of Financial Instruments      
Debt $ 790 $ 561