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Debt (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Jul. 15, 2016
Mar. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]              
Long-term Debt, Gross $ 2,895,000   $ 2,895,000       $ 2,706,000
Debt Instrument, Unamortized Discount 24,466   24,466       17,911
Loss on extinguishment of debt (2,295) $ 0 (50,638) $ 0      
Premium and fees paid on extinguishment of debt     $ 40,953 $ 0      
5.00% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Unamortized Discount           $ 17,500  
Deferred Finance Costs, Gross           2,070  
5.00% Senior Notes [Member] | Debt Instrument, Redemption, Period One [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     102.50%        
5.00% Senior Notes [Member] | Debt Instrument, Redemption, Period Two [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     100.00%        
5.00% Senior Notes [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross 1,000,000   $ 1,000,000       0
7.75% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Redemption Price, Percentage     103.875%        
Redemption price per $1,000 of tendered debt           1,059  
Unit of debt on which redemption price is paid           1,000  
Debt Instrument, Repurchased Face Amount         $ 45,551 654,000  
Debt extinguishment including principal interest and fees           703,000  
Debt Repurchase, Interest and Fees           $ 10,567  
Write off of Debt Discount     $ 8,715        
Write off of Deferred Debt Issuance Cost     970        
7.75% Senior Notes [Member] | Senior Notes [Member]              
Debt Instrument [Line Items]              
Long-term Debt, Gross 0   0       $ 700,000
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity $ 500,000   $ 500,000