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Fair Value Measurements - Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Fair Value of Financial Instruments    
Less: Deferred financing costs $ (15,453) $ (18,012)
Carrying Value    
Fair Value of Financial Instruments    
Debt 3,518,800 3,679,720
Less: Deferred financing costs (15,453) (18,012)
Debt, net of financing costs 3,503,347 3,661,708
Fair Value    
Fair Value of Financial Instruments    
Debt $ 3,440,176 3,445,699
2.35% senior notes due September 2016    
Fair Value of Financial Instruments    
Interest rate on senior notes due (as a percent) 2.35%  
2.35% senior notes due September 2016 | Carrying Value    
Fair Value of Financial Instruments    
Debt $ 338,549 347,955
2.35% senior notes due September 2016 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 338,350 347,708
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 $ 827,868 921,162
6.15% senior notes due February 2018 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 857,192 935,962
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 $ 303,489 339,607
9.25% senior notes due January 2019 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 322,648 342,575
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 $ 669,387 683,839
5.00% senior notes due September 2020 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 635,465 617,409
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 $ 698,748 698,628
4.625% senior notes due September 2021 | Fair Value    
Fair Value of Financial Instruments    
Debt $ 642,250 581,630
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 $ 349,084 349,021
5.10% senior notes due September 2023 | Fair Value    
Fair Value of Financial Instruments    
Debt 312,596 280,907
Term Loan Facility | Carrying Value    
Fair Value of Financial Instruments    
Debt 325,000 325,000
Term Loan Facility | Fair Value    
Fair Value of Financial Instruments    
Debt 325,000 325,000
Commercial paper | Carrying Value    
Fair Value of Financial Instruments    
Debt 6,500 8,000
Commercial paper | Fair Value    
Fair Value of Financial Instruments    
Debt 6,500 8,000
Other | Carrying Value    
Fair Value of Financial Instruments    
Debt 175 6,508
Other | Fair Value    
Fair Value of Financial Instruments    
Debt $ 175 $ 6,508