Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Operating activities
Net income	$ 24,257	$ 15,130
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	290	336
Net amortization of investments	4,095	4,024
Deferred income taxes	349	(36)
Net realized gains on investments	(248)	(59)
Net realized losses on disposal of assets	1
Share-based compensation	231	359
Changes in operating assets and liabilities:
Premiums receivable, net	(11,821)	(9,364)
Accrued interest receivable	(804)	(405)
Deferred policy acquisition costs	190	(1,142)
Amounts held by others	1,017	1
Other assets	(274)	612
Reserves for loss and loss adjustment expenses	4,145	17,336
Unearned premiums	1,870	3,466
Reinsurance balances	(1,306)	(470)
Amounts held for others and policyholder deposits	1,727	(418)
Accounts payable and other liabilities	6,615	2,975
Net cash provided by operating activities	30,334	32,345
Investing activities
Purchases of investments held-to-maturity	(39,852)	(55,425)
Purchases of investments available-for-sale	(65,963)	(49,215)
Purchases of short-term investments	(5,576)	(4,440)
Proceeds from maturities of investments held-to-maturity	57,603	19,828
Proceeds from sales and maturities of investments available-for-sale	34,448	21,666
Proceeds from sales and maturities of short-term investments	1,508	25,771
Purchases of property and equipment	(98)	(276)
Net cash used in investing activities	(17,930)	(42,091)
Financing activities
Proceeds from stock option exercises	454	557
Tax benefit from share-based payments	435	809
Dividends to shareholders	(3,484)	(2,845)
Net cash used in financing activities	(2,595)	(1,479)
Change in cash and cash equivalents	9,809	(11,225)
Cash and cash equivalents at beginning of period	69,481	90,956
Cash and cash equivalents at end of period	$ 79,290	$ 79,731