Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Activities
Net income	$ 15,130	$ 10,549
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	336	332
Net amortization of investments	4,024	3,765
Deferred income taxes	(36)	(906)
Net realized gains on investments	(59)	(101)
Share-based compensation	359	558
Changes in operating assets and liabilities:
Premiums receivable, net	(9,364)	(21,385)
Accrued interest receivable	(405)	(103)
Deferred policy acquisition costs	(1,142)	(1,920)
Other assets	613	(1,241)
Reserves for loss and loss adjustment expenses	17,336	21,634
Unearned premiums	3,466	13,132
Reinsurance balances	(470)	(1,829)
Amounts held for others and policyholder deposits	(418)	2,069
Accounts payable and other liabilities	2,975	5,732
Net cash provided by operating activities	32,345	30,286
Investing Activities
Purchases of investments held-to-maturity	(55,425)	(38,698)
Purchases of investments available-for-sale	(49,215)	(35,248)
Purchases of short-term investments	(4,440)	(44,920)
Proceeds from maturities of investments held-to-maturity	19,828	24,930
Proceeds from sales and maturities of investments available-for-sale	21,666	14,557
Proceeds from sales and maturities of short-term investments	25,771	43,369
Purchases of property and equipment	(276)	(208)
Net cash used in investing activities	(42,091)	(36,218)
Financing Activities
Proceeds from stock option exercises	557	600
Tax benefit from share-based payments	809	625
Dividends to stockholders	(2,845)	(11,510)
Net cash used in financing activities	(1,479)	(10,285)
Change in cash and cash equivalents	(11,225)	(16,217)
Cash and cash equivalents at beginning of period	90,956	123,077
Cash and cash equivalents at end of period	$ 79,731	$ 106,860