Summary of Significant Accounting Policies (Details) (USD $)	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013 Payment		Dec. 31, 2012		Dec. 31, 2011
Summary of Significant Accounting Policies [Abstract]
Discount rates used for the DCF model, minimum (in hundredths)	16.87%																16.87%
Discount rate used for the DCF model, maximum (in hundredths)	18.35%																18.35%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	$ 4,866,819,000								$ 4,230,275,000								$ 4,866,819,000		$ 4,230,275,000
State premium tax credit investments, average maturity																	5 years
Annual average discount rate (in hundredths)	7.30%																7.30%
Home office and equipment [Abstract]
Accumulated depreciation of home office and equipment	53,000,000								51,300,000								53,000,000		51,300,000		65,200,000
Depreciation expense of home office and equipment																	1,800,000		1,900,000		2,300,000
Loss Reserves [Abstract]
Minimum number of payments past due to be in default																	2
Share-Based Compensation [Abstract]
Minimum vesting period for share-based compensation awards (in years)																	1 year
Maximum vesting period for share-based compensation awards (in years)																	3 years
Earnings per Share [Abstract]
Antidilutive securities excluded from weighted average number of shares (in shares)																	114,300,000		61,700,000		55,600,000
Basic loss per share [Abstract]
Average common shares outstanding (in shares)																	311,754,000		201,892,000		201,019,000
Net loss	(1,407,000)		12,114,000		12,375,000		(72,930,000)		(386,691,000)	[1]	(246,942,000)		(273,891,000)		(19,555,000)		(49,848,000)		(927,079,000)		(485,892,000)
Basic loss per share (in dollars per share)	$ 0	[2]	$ 0.04	[2]	$ 0.04	[2]	$ (0.31)	[2]	$ (1.91)	[1],[2]	$ (1.22)	[2]	$ (1.36)	[2]	$ (0.10)	[2]	$ (0.16)	[2]	$ (4.59)	[2]	$ (2.42)
Diluted loss per share [Abstract]
Weighted-average shares - Basic (in shares)																	311,754,000		201,892,000		201,019,000
Common stock equivalents (in shares)																	0		0		0
Weighted-average shares - Diluted (in shares)																	311,754,000		201,892,000		201,019,000
Net loss	(1,407,000)		12,114,000		12,375,000		(72,930,000)		(386,691,000)	[1]	(246,942,000)		(273,891,000)		(19,555,000)		(49,848,000)		(927,079,000)		(485,892,000)
Diluted loss per share (in dollars per share)	$ 0	[2]	$ 0.04	[2]	$ 0.04	[2]	$ (0.31)	[2]	$ (1.91)	[1],[2]	$ (1.22)	[2]	$ (1.36)	[2]	$ (0.10)	[2]	$ (0.16)	[2]	$ (4.59)	[2]	$ (2.42)
Participating Securities with Non-forfeitable Rights to Dividends [Member]
Earnings per Share [Abstract]
Antidilutive securities excluded from weighted average number of shares (in shares)																	100,000		1,100,000		1,100,000
Home Office [Member]
Home office and equipment [Abstract]
Estimated useful life																	45 years
Equipment [Member]
Home office and equipment [Abstract]
Estimated useful life																	5 years
Data Processing Hardware [Member]
Home office and equipment [Abstract]
Estimated useful life																	3 years
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	683,015,000								1,010,932,000								683,015,000		1,010,932,000
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	4,181,060,000								3,198,778,000								4,181,060,000		3,198,778,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total investments	$ 2,744,000								$ 20,565,000								$ 2,744,000		$ 20,565,000

[1] The results for the fourth quarter of 2012 include a loss of approximately $267 million related to our settlement with Freddie Mac and approximately $100 million related to our probable rescission settlement agreements. See Note 20 – “Litigation and Contingencies.”

[2] Due to the use of weighted average shares outstanding when calculating earnings per share, the sum of the quarterly per share data may not equal the per share data for the year.