Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
OPERATING ACTIVITIES
Net income	$ 92,512,000	$ 47,097,000	$ 34,213,000
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	2,647,000	3,301,000	5,733,000
Amortization of bond discount	6,246,000	2,531,000	891,000
Depreciation and amortization	1,350,000	777,000	150,000
Bad debt expense	(250,000)	250,000
Net realized gains/losses	(1,508,000)	(304,000)	323,000
Deferred income taxes	1,016,000	(3,764,000)	(893,000)
Excess tax benefit on stock-based compensation	739,000
Changes in operating assets and liabilities:
Accrued investment income	(792,000)	(1,646,000)	(856,000)
Premiums receivable, net	(10,287,000)	(9,931,000)	(10,227,000)
Restricted cash	(8,746,000)	(4,339,000)
Prepaid reinsurance premiums	(35,369,000)	(11,896,000)	(30,658,000)
Reinsurance premiums receivable		5,337,000	(5,337,000)
Income taxes receivable		5,073,000	(5,073,000)
Deferred policy acquisition costs, net	(10,430,000)	(14,605,000)	(9,733,000)
Other assets	(2,594,000)	(2,554,000)	(1,810,000)
Unpaid losses and loss adjustment expenses	32,253,000	32,125,000	17,951,000
Unearned premiums	61,358,000	124,893,000	78,578,000
Reinsurance payable	43,097,000	(12,478,000)	20,604,000
Income taxes payable	(10,716,000)	10,003,000	(1,100,000)
Accrued compensation	1,863,000	(63,000)	504,000
Advance premiums	6,995,000	1,314,000	3,824,000
Other liabilities	(15,524,000)	23,075,000	7,967,000
Net cash provided by operating activities	153,860,000	194,196,000	105,051,000
INVESTING ACTIVITIES
Proceeds from sales and maturities of investments available for sale	151,307,000	38,738,000	7,424,000
Purchases of investments available for sale	(237,946,000)	(231,070,000)	(126,971,000)
Proceeds from sale of investment in mortgage loan	6,849,000	(786,000)	(6,063,000)
Acquisition of a business	(6,000,000)
Cost of property and equipment acquired	(1,174,000)	(6,929,000)	(10,884,000)
Net cash used in investing activities	(86,964,000)	(200,047,000)	(136,494,000)
FINANCING ACTIVITIES
Proceeds from issuance of equity and redeemable shares		88,000	33,630,000
Proceeds from issuance of equity from initial public offering, net of discount fee and expense		78,670,000
Proceeds from exercise of stock options and warrants	8,900,000	22,515,000
Repayment on note payable to bank			(1,000,000)
Net cash provided by financing activities	8,900,000	101,273,000	32,630,000
Increase in cash and cash equivalents	75,796,000	95,422,000	1,187,000
Cash and cash equivalents at beginning of period	160,481,000	65,059,000	63,872,000
Cash and cash equivalents at end of period	236,277,000	160,481,000	65,059,000
Supplemental Cash Flows Information:
Interest paid			16,000
Income taxes paid, net	68,824,000	13,038,000	$ 28,314,000
Temporary equity reclassified to equity		$ 20,921,000
Supplemental Disclosure of Non-Cash Investing Activities
Issuance of shares for consideration in the acquisition of a business	$ 2,000,000