Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income (loss)	$ 25,882	$ 201,700	$ (61,833)
Adjustments to reconcile net income (loss) to net cash (used in) operating activities:
Amortization of premium or discount on fixed maturity securities	116	227	574
Net realized loss (gain) on sale of investments	68	(24)	(324)
Unrealized (gain) on trading securities	(61)	41	463
(Gain) loss on derivative embedded conversion feature	(28,242)	(201,499)	54,621
Equity-based compensation	517	658	1,129
Changes in assets and liabilities:
Accrued investment income	128	48	241
Other assets	(51)	212	157
Cash equivalents held in trust	(2,023)	1,511	7,435
Losses and loss adjustment reserves	(337)	(4,252)	(13,884)
Losses payable	(53)	(352)	(291)
Unearned premiums	(231)	(491)	(333)
Accrued ceding commission expense	(22)	(11)	(11)
Accrued interest on notes payable	(203)	(33)	(102)
Loss contract reserve	(5,645)	(3,978)	(2,926)
Other liabilities	3,740	(294)	904
Total adjustments	(32,299)	(208,237)	47,653
Net cash used in operating activities	(6,417)	(6,537)	(14,180)
Cash flows from investing activities:
Purchase of investments	(19,974)	(180,439)	(269,694)
Proceeds from sales and maturities of investments	93,022	202,419	230,567
Net cash provided by (used in) investing activities	73,048	21,980	(39,127)
Cash flows from financing activities:
Proceeds from issuance of preferred stock			600,000
Fees incurred and paid relating to preferred stock issuance			(19,310)
Redeemable convertible series B preferred stock dividends	(18,050)	(18,000)	(16,998)
Notes payable – principal repayments	(18,774)	(2,969)	(10,395)
Notes payable – principal issued			918
Net cash (used in) provided by financing activities	(36,824)	(20,969)	554,215
Increase (decrease) in cash and cash equivalents	29,807	(5,526)	500,908
Cash, cash equivalents and restricted cash, beginning of period	575,838	581,364	80,456
Cash, cash equivalents and restricted cash, end of period	605,645	575,838	581,364
Supplementary disclosure of cash flow information:
Cash paid during the period, Interest	1,991	$ 2,647	2,887
Supplementary disclosure of non-cash investing and financing activities:
Reclassification of derivative asset	108,893		66,227
Notes payable issued in lieu of cash interest payments			918
Redeemable convertible series B preferred stock dividends accrued			750
Accrued fees relating to series B preferred stock issuance	$ (1,500)		$ 12,250