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Fair Value Disclosures (Estimated Fair Values and Carrying Amounts of Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Cash and cash equivalents, at carrying value $ 6,719,134 $ 567,599    
Cash and cash equivalents, fair value 6,719,134 567,599    
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations 6,719,134 567,599 $ 156,219 $ 178,810
Restricted cash, current and non-current, carrying value 120,730 129,547    
Restricted cash, current and non-current, fair value 120,730 129,547    
Long-term debt and other obligations, carrying amount 15,204,415 12,171,142    
Long-term debt and other obligations, fair value $ 15,848,408 $ 12,660,013