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Fair Value Disclosures (Estimated Fair Values and Carrying Amounts of Assets and Liabilities) (Details) - USD ($)
 3 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, carrying value $ 202,338,000 $ 178,810,000
Cash and cash equivalents, fair value 202,338,000 178,810,000
Restricted cash, current and non-current, carrying value 137,119,000 135,731,000
Restricted cash, current and non-current, fair value 137,119,000 135,731,000
Foreign currency swaps, at carrying value 0 10,749,000
Foreign currency swaps, at fair value 0 10,749,000
Long-term debt and other obligations, carrying amount [1] 12,426,204,000 12,149,959,000
Long-term debt and other obligations, fair value 13,261,419,000 $ 12,555,143,000
Cash and Cash Equivalents [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, carrying value 1  
Restricted cash, current and non-current, carrying value 1  
Long-term Debt [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative, Gain (Loss) on Derivative, Net 2  
Long-term debt and other obligations, carrying amount $ 2  
[1] Balances reflect debt issuance costs as a direct reduction from the respective carrying amounts of debt, with the exception of debt issuance costs associated with the Company's revolving credit facilities. See note 2.