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Basis of Presentation (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jan. 01, 2016
Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Total assets $ 1,886,504   $ 2,922,027
Noncontrolling interest (21)   510,184
Retained earnings $ (7,985,411)   (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