Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Debt (Subordinated Debt Joint Venture Partners Narrative) (Details)

v3.3.1.900
Debt (Subordinated Debt Joint Venture Partners Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2012
Debt Instrument [Line Items]      
Long-term Debt $ 29,806,843 $ 30,402,392  
Subordinated Debt Joint Ventures Partners [Member]      
Debt Instrument [Line Items]      
Stated interest rate 0.00%    
Interest rate paid on unpaid interest 19.50%    
Subordinated Debt Joint Ventures Partners Before Amendment [Member]      
Debt Instrument [Line Items]      
Stated interest rate     20.00%
Minimum [Member] | Subordinated Debt Joint Ventures Partners [Member]      
Debt Instrument [Line Items]      
Stated interest rate 15.00%    
Subordinated Debt [Member]      
Debt Instrument [Line Items]      
Long-term Debt $ 1,564,045 1,064,042  
Subordinated Debt [Member] | Subordinated Debt Joint Ventures Partners [Member]      
Debt Instrument [Line Items]      
Long-term Debt $ 64,280 $ 64,280