Business Acquired - Summary of fair value of net assets acquired and allocation of purchase price(Details) (CMG Mortgage Insurance Company, USD $) In Thousands, unless otherwise specified	0 Months Ended
	Jan. 30, 2014	Mar. 31, 2014
Business Acquisition [Line Items]
Cash paid	$ 245,157
Contingent consideration liability	41,762	43,156
Total purchase price (a)	286,919
Cash	9,579
Investments, at fair value	312,093
Other assets acquired	21,691
Total assets acquired	437,650
Reserves for losses and loss adjustment expenses	121,572
Unearned premiums	26,261
Intangible liability -- unfavorable service contract	9,533
Other liabilities acquired	7,217
Total liabilities acquired	164,583
Net assets acquired	273,067
Goodwill	13,852
Useful life of finite lived intangible liabilities acquired	9 years
Insurance licenses
Business Acquisition [Line Items]
Intangible asset -- insurance licenses	16,858
Acquired insurance contracts
Business Acquisition [Line Items]
Intangible asset	46,473
Useful life of finite lived intangible assets acquired	5 years
Operating platform
Business Acquisition [Line Items]
Intangible asset	29,900
Useful life of finite lived intangible assets acquired	5 years
Favorable lease contract
Business Acquisition [Line Items]
Intangible asset	$ 1,056
Useful life of finite lived intangible assets acquired	5 years