Reinsurance (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 Company		Mar. 31, 2014		Dec. 31, 2014
Reinsurance [Abstract]
Profit commission receivable	$ 114,974,000				$ 91,500,000
Number of other mortgage insurers agreeing to similar CFPB settlements	3
Period of existing captive reinsurance agreement	10 years
Reinsurance recoverable on loss reserves related to captive agreements	39,000,000				45,000,000
Fair value of trust fund assets under captive agreements	168,000,000				198,000,000
Premiums Written and Earned [Abstract]
Ceded premiums written, net of profit commission	27,136,000		21,486,000
Ceded premiums earned, net of profit commission	24,613,000		19,627,000
Ceded losses incurred	4,873,000		2,519,000
Ceding commissions	$ 10,122,000	[1]	$ 8,740,000	[1]

[1] Ceding commissions are reported within Other underwriting and operating expenses, net on the consolidated statements of operations.