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Long-Term Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 12, 2016
Jun. 22, 2015
May 21, 2015
Nov. 17, 2014
May 20, 2013
Jun. 29, 2012
Nov. 08, 2011
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Aug. 12, 2016
Jun. 05, 2015
May 20, 2015
Debt Instrument [Line Items]                            
Senior Notes, net of unamortized deferred financing costs                 $ 2,766,719,000 $ 2,315,970,000        
Gains (Losses) on Extinguishment of Debt                 15,722,000 (16,578,000) $ 0      
Gains (Losses) on Extinguishment of Debt, Non-Cash Portion                 15,722,000 (4,123,000) 0      
Net proceeds from debt issuance                 491,640,000 490,951,000 589,991,000      
Proceeds from Convertible Debt Net of Issuance Costs                 166,617,000 0 0      
Convertible Debt, Noncurrent                 130,856,000 0        
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Net of Issuance Costs and Deferred Taxes                 33,575,000          
Capped Call Transaction Costs                 $ 24,195,000          
Capped Call, Cap Price                 $ 60.00          
Interest Costs, Capitalized During Period                 $ 17,000,000 25,100,000 $ 16,200,000      
Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Face Amount                 2,803,736,000 2,350,000,000        
Unamortized Debt Issuance Expense                 37,017,000 34,030,000        
Debt Instrument, Covenant Compliance, Dividends Excluded From Computation                 6,500,000          
Debt Instrument, Repurchased Face Amount               $ 46,300,000            
Debt Instrument, Repurchased Settlement Amount               29,900,000            
Gains (Losses) on Extinguishment of Debt               15,722,000            
Debt Instrument, Repurchase Discount               16,400,000            
Gains (Losses) on Extinguishment of Debt, Non-Cash Portion               (700,000)            
6.50% Senior Notes Due 2021 [Member]                            
Debt Instrument [Line Items]                            
Unamortized Debt Issuance Expense                 3,372,000 4,106,000        
Senior Notes, net of unamortized deferred financing costs                 $ 343,583,000 345,894,000        
6.50% Senior Notes Due 2021 [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage             6.50%   6.50%          
Debt Instrument, Face Amount             $ 350,000,000   $ 346,955,000 350,000,000        
Debt Instrument, Repurchased Face Amount               3,100,000            
Debt Instrument, Repurchased Settlement Amount               2,300,000            
Net proceeds from debt issuance             343,100,000              
Debt Issuance Costs, Gross             $ 6,900,000              
6.125% Senior Notes Due 2022 [Member]                            
Debt Instrument [Line Items]                            
Unamortized Debt Issuance Expense                 6,979,000 8,714,000        
Senior Notes, net of unamortized deferred financing costs                 $ 554,817,000 591,286,000        
6.125% Senior Notes Due 2022 [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage       6.125%         6.125%          
Debt Instrument, Face Amount       $ 600,000,000         $ 561,796,000 600,000,000        
Debt Instrument, Repurchased Face Amount               38,200,000            
Debt Instrument, Repurchased Settlement Amount               24,300,000            
Net proceeds from debt issuance       590,000,000                    
Debt Issuance Costs, Gross       $ 10,000,000                    
6.50% Senior Notes Due 2023 [Member]                            
Debt Instrument [Line Items]                            
Unamortized Debt Issuance Expense                 4,436,000 5,231,000        
Senior Notes, net of unamortized deferred financing costs                 $ 390,549,000 394,769,000        
6.50% Senior Notes Due 2023 [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage           6.50%     6.50%          
Debt Instrument, Face Amount           $ 400,000,000     $ 394,985,000 400,000,000        
Debt Instrument, Repurchased Face Amount               5,000,000            
Debt Instrument, Repurchased Settlement Amount               $ 3,300,000            
Net proceeds from debt issuance           392,100,000                
Debt Issuance Costs, Gross           $ 7,900,000                
5% Senior Notes Due 2024 [Member]                            
Debt Instrument [Line Items]                            
Unamortized Debt Issuance Expense                 6,533,000 7,455,000        
Senior Notes, net of unamortized deferred financing costs                 $ 493,467,000 492,545,000        
5% Senior Notes Due 2024 [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage         5.00%       5.00%          
Debt Instrument, Face Amount         $ 500,000,000       $ 500,000,000 500,000,000        
Net proceeds from debt issuance         490,200,000                  
Debt Issuance Costs, Gross         $ 9,800,000                  
5.625% Senior Notes Due 2025 [Member]                            
Debt Instrument [Line Items]                            
Unamortized Debt Issuance Expense                 7,619,000 8,524,000        
Senior Notes, net of unamortized deferred financing costs                 $ 492,381,000 491,476,000        
5.625% Senior Notes Due 2025 [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage     5.625%           5.625%          
Debt Instrument, Face Amount     $ 500,000,000           $ 500,000,000 500,000,000        
Net proceeds from debt issuance     491,000,000                      
Debt Issuance Costs, Gross     $ 9,000,000                      
6.75% Senior Notes Due 2026 [Member]                            
Debt Instrument [Line Items]                            
Unamortized Debt Issuance Expense                 8,078,000 0        
Senior Notes, net of unamortized deferred financing costs                 $ 491,922,000 0        
6.75% Senior Notes Due 2026 [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage 6.75%               6.75%          
Debt Instrument, Face Amount $ 500,000,000               $ 500,000,000 0        
Net proceeds from debt issuance 491,600,000                          
Debt Issuance Costs, Gross $ 8,400,000                          
6.625% Senior Notes Due 2019 [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage                           6.625%
Debt Instrument, Repurchased Face Amount                         $ 1,500,000 $ 242,900,000
Gains (Losses) on Extinguishment of Debt                   (16,600,000)        
Gains (Losses) on Extinguishment of Debt, Non-Cash Portion                   (4,100,000)        
Price per Note Tendered                         1,006.88 1,036.88
Debt Instrument, Face Amount, Individual Note                         1,000 $ 1,000
Percentage of Notes Tendered                           69.00%
Debt Instrument, Repurchase Amount                         $ 1,600,000 $ 256,200,000
Debt Instrument, Repurchase Premium                   12,500,000        
6.625% Senior Notes Due 2019 [Member] | From February 15, 2015 to February 14, 2016 [Member] | Senior Notes [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Repurchase Amount   $ 111,500,000                        
Debt Instrument, Redemption Price, Percentage   103.313%                        
1.50% Senior Convertible Notes Due 2021 [Domain] | Convertible Debt [Member]                            
Debt Instrument [Line Items]                            
Debt Instrument, Interest Rate, Stated Percentage                 1.50%     1.50%    
Debt Instrument, Face Amount                 $ 172,500,000 $ 0   $ 172,500,000    
Unamortized Debt Issuance Expense                 4,131,000          
Debt Issuance Costs, Gross                 5,900,000          
Proceeds from Convertible Debt Net of Issuance Costs                 $ 166,617,000          
Debt Instrument, Convertible, Threshold Trading Days                 20          
Debt Instrument, Convertible, Threshold Consecutive Trading Days                 30 days          
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger                 130.00%          
Debt Instrument, Convertible, Threshold Business Days, Trading Price Trigger                 5 days          
Debt Instrument, Convertible, Threshold Trading Days, Trading Price Trigger                 5 days          
Debt Instrument, Principal Amount of Note                 $ 1,000          
Debt Instrument, Convertible, Threshold Percentage of Trading Price Trigger                 98.00%          
Debt Instrument, Convertible, Conversion Ratio                 24.6914          
Debt Instrument, Convertible, Conversion Price                 $ 40.50          
Debt Instrument, Convertible, Comparable Yield                 7.25%          
Debt Instrument, Convertible, Initial Fair Value of Liability Component                       132,300,000    
Debt Instrument, Convertible, Initial Fair Value of Liability Component                 $ 40,217,000     $ 40,217,000    
Interest Expense, Debt                 3,700,000          
Debt Instrument, Unamortized Discount                 (37,513,000)          
Convertible Debt, Noncurrent                 130,856,000          
Debt Issuance Costs, Gross, Equity Component of Convertible Debt                 (1,375,000)          
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt                 (5,267,000)          
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt, Net of Issuance Costs and Deferred Taxes                 $ 33,575,000