Reinsurance - Summary of Quota Share Reinsurance Agreements (Details) - USD ($) $ in Thousands			3 Months Ended								12 Months Ended
		Jul. 01, 2015	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Effects of Reinsurance [Line Items]
Ceded premiums written, net of profit commission											$ 55,391		$ 119,634		$ 73,503
Ceded to Other Companies											102,848		108,255		38,101
Ceded losses incurred											27,685		29,986		27,790
Premiums Earned, Net [Abstract]
Premiums earned, direct											997,892		950,973		979,078
Premiums earned, assumed											1,178		1,653		2,074
Premiums earned, ceded											(102,848)		(108,255)		(38,101)
Net premiums earned			$ 226,192	$ 239,234	$ 213,508	$ 217,288	$ 213,589	$ 209,035	$ 207,486	$ 214,261	896,222		844,371		943,051
Policyholder Benefits and Claims Incurred, Net [Abstract]
Losses incurred, direct											369,680		524,051		863,871
Losses incurred, assumed											1,552		2,012		2,645
Losses incurred, ceded											(27,685)		(29,986)		(27,790)
Net losses incurred			$ 95,066	76,458	$ 90,238	$ 81,785	$ 117,074	$ 115,254	$ 141,141	$ 122,608	343,547		496,077		838,726
Quota Share Reinsurance Agreement, 2013
Effects of Reinsurance [Line Items]
Ceded premiums written, net of profit commission				69,400							(11,355)	[1]	100,031		49,672
Ceded to Other Companies				11,600							35,999	[1]	88,528		13,821
Ceded losses incurred											6,060		15,163		176
Reinsurance, ceding commission				11,600							10,235	[1],[2]	37,833	[2]	10,408	[2]
Profit commission		$ 142,500									62,525	[1]	89,133		2,368
Premiums Earned, Net [Abstract]
Premiums earned, ceded				$ (11,600)							(35,999)	[1]	(88,528)		(13,821)
Policyholder Benefits and Claims Incurred, Net [Abstract]
Losses incurred, ceded											(6,060)		$ (15,163)		$ (176)
Quota Share Reinsurance Agreement, 2015
Effects of Reinsurance [Line Items]
Ceded premiums written, net of profit commission	[3]										52,588
Ceded to Other Companies	[3]										52,588
Ceded losses incurred											11,424
Reinsurance, ceding commission	[2]										20,582
Profit commission											50,322
Premiums Earned, Net [Abstract]
Premiums earned, ceded	[3]										(52,588)
Policyholder Benefits and Claims Incurred, Net [Abstract]
Losses incurred, ceded											$ (11,424)

[1] The year ended December 31, 2015 includes the non-recurring impact of commuting our 2013 QSR Transaction. The commutation had no impact on ceded losses incurred.

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

[3] As of July 1, 2015, premiums are ceded on an earned and received basis as defined in our 2015 QSR Transaction.