Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2007	Dec. 31, 2013
Tax provision (benefit) [Abstract]
Tax provision (benefit) before valuation allowance	$ 17,172,000	$ 4,472,000	$ 40,292,000	$ (17,118,000)
Change in valuation allowance	(16,054,000)	(3,482,000)	(38,448,000)	19,247,000
Provision for income taxes	1,118,000	990,000	1,844,000	2,129,000
Change in deferred tax valuation allowance, included in other comprehensive income	14,600,000	33,500,000	27,900,000	36,600,000
Valuation allowance	937,900,000		937,900,000			1,004,200,000
Net operating loss carryforwards, regular tax basis	2,500,000,000		2,500,000,000
Net operating loss carryforwards for computing the alternative minimum tax	1,700,000,000		1,700,000,000
Information regarding income tax examinations [Abstract]
Amount of IRS assessment for unpaid taxes and penalties related to REMIC issue					197,500,000
Estimate of federal interest that may be due	161,300,000		161,300,000
Estimate of additional state income taxes and interest that may be due	46,700,000		46,700,000
Amount of payment made related to the IRS assessment on the REMIC issue					65,200,000
Total amount of unrecognized tax benefits	105,800,000		105,800,000
Total amount of the unrecognized tax benefits that would affect our effective tax rate	93,200,000		93,200,000
Unrecognized tax benefits, accrued interest	$ 26,500,000		$ 26,500,000			$ 26,100,000