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Fair Value Measurements - Debt (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Fair Value of Financial Instruments    
Less: deferred financing costs $ 33,298 $ 26,049
Carrying Value    
Fair Value of Financial Instruments    
Debt 3,695,276 3,604,681
Less: deferred financing costs 33,298 26,049
Debt, net of financing costs 3,661,978 3,578,632
Fair Value    
Fair Value of Financial Instruments    
Debt $ 3,784,424 3,739,129
6.15% senior notes due February 2018    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 6.15%  
6.15% senior notes due February 2018 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 665,222 827,539
6.15% senior notes due February 2018 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 690,168 865,300
9.25% senior notes due January 2019    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 9.25%  
9.25% senior notes due January 2019 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 303,489 303,489
9.25% senior notes due January 2019 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 337,252 337,443
5.00% senior notes due September 2020    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 5.00%  
5.00% senior notes due September 2020 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 669,616 669,540
5.00% senior notes due September 2020 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 694,311 689,211
4.625% senior notes due September 2021    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 4.625%  
4.625% senior notes due September 2021 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 694,928 694,868
4.625% senior notes due September 2021 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 706,658 708,765
5.50% senior notes due January 2023    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 5.50%  
5.50% senior notes due January 2023 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 600,000 600,000
5.50% senior notes due January 2023 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 615,378 627,000
5.10% senior notes due September 2023    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 5.10%  
5.10% senior notes due September 2023 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 346,480 346,448
5.10% senior notes due September 2023 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 351,462 348,613
0.75% senior exchangeable notes due January 2024    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 0.75%  
0.75% senior exchangeable notes due January 2024 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 415,228  
0.75% senior exchangeable notes due January 2024 | Fair Value    
Fair Value of Financial Instruments    
Debt 388,882  
Term Loan Facility | Carrying Value    
Fair Value of Financial Instruments    
Debt   162,500
Term Loan Facility | Fair Value    
Fair Value of Financial Instruments    
Debt   162,500
Other | Carrying Value    
Fair Value of Financial Instruments    
Debt 313 297
Other | Fair Value    
Fair Value of Financial Instruments    
Debt $ 313 $ 297