Schedule VI - Supplemental Information Concerning Insurance Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Claim and claim adjustment expenses incurred related to current year	$ 113,819	$ 79,932	$ 56,209
Claim and claim adjustment expenses incurred related to prior year	(9,466)	1,104	201
Property and Casualty Insurance [Member]
Supplemental Information for Property, Casualty Insurance Underwriters [Line Items]
Deferred acquisition costs	15,547	13,610	16,708
Loss and loss adjustment expense reserves	97,340	78,330	61,016
Unearned premiums	253,960	192,424	128,343
Earned premiums	210,020	170,905	104,381
Net investment income	7,226	5,385	3,332
Claim and claim adjustment expenses incurred related to current year	113,819	79,932	56,209
Claim and claim adjustment expenses incurred related to prior year	(9,466)	1,104	201
Amortization of deferred acquisition costs	37,276	27,474	21,447
Paid claims and claims adjustment expense	82,445	71,803	44,403
Premiums written	$ 225,253	$ 175,158	$ 160,664