Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 29,005	$ 40,896
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	529	594
Net amortization of investments	7,394	8,163
Deferred income taxes	302	291
Net realized (gains) losses on investments	569	(793)
Net realized losses on disposal of assets	2	1
Share-based compensation	937	744
Changes in operating assets and liabilities:
Premiums receivable, net	(7,641)	(22,871)
Accrued interest receivable	153	37
Deferred policy acquisition costs	(1,582)	(263)
Amounts held by others		1,016
Other assets	(1,900)	(756)
Reserves for loss and loss adjustment expenses	6,983	7,516
Unearned premiums	3,867	11,817
Reinsurance balances	(509)	(3,270)
Amounts held for others and policyholder deposits	1,882	4,700
Accounts payable and other liabilities	807	8,539
Net cash provided by operating activities	40,798	56,361
Investing activities
Purchases of investments held-to-maturity	(96,697)	(76,920)
Purchases of investments available-for-sale	(50,193)	(132,699)
Purchases of short-term investments	(30,800)	(12,132)
Proceeds from maturities of investments held-to-maturity	66,276	103,565
Proceeds from sales and maturities of investments available-for-sale	54,062	66,755
Proceeds from sales and maturities of short-term investments	13,610	2,507
Proceeds from redemption of other invested assets	6,000
Purchases of property and equipment	(240)	(850)
Net cash used in investing activities	(37,982)	(49,774)
Financing activities
Proceeds from stock option exercises		501
Tax benefit from share-based payments		546
Dividends to shareholders	(7,785)	(6,960)
Net cash used in financing activities	(7,785)	(5,913)
Change in cash and cash equivalents	(4,969)	674
Cash and cash equivalents at beginning of period	58,936	69,481
Cash and cash equivalents at end of period	$ 53,967	$ 70,155