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Fair Value Disclosures (Estimated Fair Values and Carrying Amounts of Assets and Liabilities) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, carrying value $ 178,810,000 $ 151,312,000
Cash and cash equivalents, fair value 178,810,000 151,312,000
Restricted cash, carrying value 135,731,000 152,411,000
Restricted cash, fair value 135,731,000 152,411,000
Debt Instrument Maturity Date Range 10,749,000 0
Derivative Assets (Liabilities), at Fair Value, Net 10,749,000 0
Debt and other obligations, carrying amount 12,249,238,000 11,920,861,000
Debt and other obligations, fair value 12,555,143,000 12,286,161,000
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents, carrying value 1  
Restricted cash, carrying value 1  
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt Instrument, Issuance Date 2  
Debt and other obligations, carrying amount 2  
Securitized Debt [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt and other obligations, carrying amount 4,041,592,000 3,573,208,000
Fixed Rate Securitized Debt May 2015 Tower Revenue Notes [Member] [Domain] | Securitized Debt [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Debt and other obligations, carrying amount $ 1,000,000,000 $ 0