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Basis of Presentation (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Jan. 01, 2016
Dec. 31, 2015
Mar. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total assets $ 2,574,059   $ 2,922,027 $ 2,922,027
Noncontrolling interest (21)   510,184  
Retained earnings $ (7,059,723)   (6,992,697)  
Accounting Standards Updates (ASU) 2015-02        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Total assets   $ (243,400)    
Noncontrolling interest   (510,200)    
Accounts payable   9,700    
Retained earnings   $ 257,100    
Accounting Standards Updates (ASU) 2015-03 | Other assets        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Debt issuance costs     69,100  
Accounting Standards Updates (ASU) 2015-03 | Current maturities of long-term debt        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Debt issuance costs     $ 69,100