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Income Taxes (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2007
Dec. 31, 2015
Dec. 31, 2014
Valuation Allowance [Line Items]              
Number of years used in the cumulative income position calculation     3 years        
Provision for income tax $ 27,131 $ 43,694 $ 117,646 $ 131,568      
Change in valuation allowance 0 (739,298) 0 (822,465)      
Provision for (benefit from) income taxes 27,131 (695,604) 117,646 (690,897)      
Net operating loss carryforwards, regular tax basis 1,600,000   1,600,000        
Net operating loss carryforwards for computing the alternative minimum tax 700,000   700,000        
Information regarding income tax examinations [Abstract]              
Amount of IRS assessment for unpaid taxes and penalties related to REMIC issue             $ 197,500
Estimate of federal interest that may be due 195,900   195,900        
Amount of payment made related to the IRS assessment on the REMIC issue         $ 65,200    
Amount of IRS assessment for unpaid taxes and penalties related to disallowance of carryback of 2009 net operating loss             $ 261,400
Estimate of additional state income taxes and interest that may be due 50,200   50,200        
Total amount of unrecognized tax benefits 107,900   107,900        
Total amount of the unrecognized tax benefits that would affect our effective tax rate 94,400   94,400        
Unrecognized tax benefits, accrued interest $ 28,600   $ 28,600     $ 27,800  
Other Comprehensive Income (Loss)              
Valuation Allowance [Line Items]              
Change in valuation allowance   $ 70,000   $ 54,500