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Long-Term Debt Senior Notes (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Aug. 12, 2016
Debt Instrument [Line Items]        
Senior Notes, Noncurrent $ 2,765,714,000   $ 2,766,719,000  
Early Repayment of Senior Debt 2,344,000 $ 19,917,000    
Gain (Loss) on Extinguishment of Debt (35,000) 15,722,000    
Gains (losses) on extinguishment of debt, noncash portion (22,000) 15,722,000    
Convertible Debt, Noncurrent $ 132,889,000   130,856,000  
Capped Call, Cap Price $ 60.00      
6.50% Senior Notes Due 2021 [Member]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense $ 3,176,000 [1]   3,372,000 [2]  
Senior Notes, Noncurrent 341,435,000 [1]   343,583,000 [2]  
Debt Instrument, Repurchased Face Amount 2,300,000      
6.125% Senior Notes Due 2022 [Member]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense 6,684,000   6,979,000 [2]  
Senior Notes, Noncurrent 555,112,000   554,817,000 [2]  
6.50% Senior Notes Due 2023 [Member]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense 4,254,000   4,436,000 [2]  
Senior Notes, Noncurrent 390,731,000   390,549,000 [2]  
5% Senior Notes Due 2024 [Member]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense 6,302,000   6,533,000  
Senior Notes, Noncurrent 493,698,000   493,467,000  
5.625% Senior Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense 7,393,000   7,619,000  
Senior Notes, Noncurrent 492,607,000   492,381,000  
6.75% Senior Notes Due 2026 [Domain]        
Debt Instrument [Line Items]        
Unamortized Debt Issuance Expense 7,869,000   8,078,000  
Senior Notes, Noncurrent 492,131,000   491,922,000  
Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Face Amount 2,801,392,000   2,803,736,000  
Unamortized Debt Issuance Expense 35,678,000   37,017,000  
Senior Notes, Noncurrent $ 2,765,714,000   2,766,719,000  
Debt Instrument, Repurchased Face Amount   46,300,000    
Debt Instrument, Repurchased Settlement Amount   29,900,000    
Early Repayment of Senior Debt   19,917,000    
Early Repayment of Senior Debt, Accrued   10,000,000    
Gain (Loss) on Extinguishment of Debt   15,700,000    
Debt Instrument, Repurchase Discount   16,400,000    
Gains (losses) on extinguishment of debt, noncash portion   $ (700,000)    
Senior Notes [Member] | 6.50% Senior Notes Due 2021 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.50%      
Debt Instrument, Face Amount $ 344,611,000   346,955,000  
Senior Notes [Member] | 6.125% Senior Notes Due 2022 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.125%      
Debt Instrument, Face Amount $ 561,796,000   561,796,000  
Senior Notes [Member] | 6.50% Senior Notes Due 2023 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.50%      
Debt Instrument, Face Amount $ 394,985,000   394,985,000  
Senior Notes [Member] | 5% Senior Notes Due 2024 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.00%      
Debt Instrument, Face Amount $ 500,000,000   500,000,000  
Senior Notes [Member] | 5.625% Senior Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 5.625%      
Debt Instrument, Face Amount $ 500,000,000   500,000,000  
Senior Notes [Member] | 6.75% Senior Notes Due 2026 [Domain]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.75%      
Debt Instrument, Face Amount $ 500,000,000   500,000,000  
Convertible Debt [Member] | 1.50% Senior Convertible Notes Due 2021 [Domain]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 1.50%      
Debt Instrument, Face Amount $ 172,500,000   172,500,000  
Unamortized Debt Issuance Expense $ 3,898,000   4,131,000  
Debt Instrument, Convertible, Conversion Ratio 24.6914      
Debt Instrument, Principal Amount of Note $ 1,000      
Debt Instrument, Convertible, Conversion Price $ 40.50      
Debt Instrument, Convertible, Initial Fair Value of Liability Component       $ 132,300,000
Debt Instrument, Convertible, Comparable Yield 7.25%      
Debt Instrument, Convertible, Carrying Amount of Equity Component       $ 40,200,000
Interest Expense, Debt $ 2,400,000      
Debt Instrument, Unamortized Discount (35,713,000)   (37,513,000)  
Convertible Debt, Noncurrent $ 132,889,000   $ 130,856,000  
[1] During the first quarter of 2017, the Company repurchased a total of $2.3 million in aggregate principal amount of 6.50% Senior Notes due 2021 in open market transactions at a slight premium. The Company canceled all of these repurchased Senior Notes upon cash settlement.
[2] During the first quarter of 2016, the Company repurchased a total of $46.3 million in aggregate principal amount of certain of its Senior Notes in open market transactions for a settlement amount of $29.9 million, excluding interest, of which $19.9 million was paid during the three months ended March 31, 2016, with the remaining $10.0 million settlement amount being accrued at March 31, 2016, and paid in the second quarter of 2016. The Company recorded a net gain on extinguishment of debt of approximately $15.7 million for the three months ended March 31, 2016. This amount includes a gain of approximately $16.4 million associated with the discount realized upon repurchase, which was partially offset by approximately $0.7 million related to the acceleration of unamortized deferred financing costs. The Company canceled all of these repurchased Senior Notes upon cash settlement.