Loss Reserves - Aging of Primary Default Inventory and Number of Delinquent Payments (Details) - loan		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Aging of the Primary Default Inventory [Abstract]
3 months or less		13,053	15,319	18,941
3 months or less (in hundredths)		21.00%	19.00%	18.00%
4 - 11 months		15,763	19,710	24,514
4 - 11 months (in hundredths)		25.00%	25.00%	24.00%
12 months or more	[1]	33,817	44,872	59,873
12 months or more (in hundredths)	[1]	54.00%	56.00%	58.00%
Total primary default inventory		62,633	79,901	103,328	139,845
Total primary default inventory (in hundredths)		100.00%	100.00%	100.00%
Primary claims received inventory included in ending default inventory	[2]	2,769	4,746	6,948
Primary claims received inventory included in ending default inventory (in hundredths)	[2]	4.00%	6.00%	7.00%
Number of Payments Delinquent [Abstract]
3 payments or less		20,360	23,253	28,095
3 payments or less (in hundredths)		33.00%	29.00%	27.00%
4 - 11 payments		15,092	19,427	24,605
4 - 11 payments (in hundredths)		24.00%	24.00%	24.00%
12 payments or more		27,181	37,221	50,628
12 payments or more (in hundredths)		43.00%	47.00%	49.00%
Total primary default inventory		62,633	79,901	103,328	139,845
Total primary default inventory (in hundredths)		100.00%	100.00%	100.00%

[1] Approximately 50%, 53% and 49% of the primary default inventory in default for 12 consecutive months or more has been in default for at least 36 consecutive months as of December 31, 2015, 2014 and 2013, respectively.

[2] Our claims received inventory includes suspended rescissions, as we have voluntarily suspended rescissions of coverage related to loans that we believed would be included in a potential resolution. As of December 31, 2015, rescissions of coverage on approximately 435 loans had been voluntarily suspended.