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	$ 51,023	$ 49,904	$ 89,126
Less net income from discontinued operations, net of taxes	6,153	786	3,806
Adjustments to reconcile net income to net cash provided by operating activities
Net accretion of bond premium	8,872	7,049	5,420
Depreciation and amortization	4,574	6,035	6,473
Stock-based compensation expense	4,808	3,696	2,510
Net realized investment gains	(4,055)	(4,947)	(1,124)
Net cash flows from trading investments	(1,909)	(2,390)	3,080
Deferred income tax expense (benefit)	(5,921)	3,331	(5,574)
Changes in:
Accrued investment income	(224)	(874)	(363)
Premiums receivable	(22,311)	(29,685)	(27,487)
Deferred policy acquisition costs	5,260	(2,815)	(17,686)
Reinsurance receivables	(487)	4,206	12,609
Prepaid reinsurance premiums	33	8	(158)
Income taxes receivable	8,254	(14,285)	0
Other assets	(2,465)	758	(1,097)
Losses, claims and loss settlement expenses	100,287	120,001	34,458
Unearned premiums	21,589	28,830	36,336
Accrued expenses and other liabilities	(423)	(7,605)	16,470
Income taxes payable	0	(5,365)	66
Deferred income taxes	(25,883)	1,495	(858)
Other, net	3,378	(9,943)	(2,914)
Cash from operating activities - continuing operations	93,377	97,500	60,161
Cash from operating activities - discontinued operations	31,847	67,766	44,518
Total adjustments	125,224	165,266	104,679
Net cash provided by operating activities	170,094	214,384	189,999
Cash Flows From Investing Activities
Proceeds from sale of available-for-sale investments	7,404	1,968	478
Proceeds from call and maturity of held-to-maturity investments	150	493	105
Proceeds from call and maturity of available-for-sale investments	191,521	323,653	247,692
Proceeds from short-term and other investments	6,032	1,947	3,881
Purchase of held-to-maturity investments	(150)	(42)	(450)
Purchase of available-for-sale investments	(260,957)	(443,953)	(355,192)
Purchase of short-term and other investments	(6,428)	(4,155)	(5,103)
Net purchases and sales of property and equipment	(17,158)	(7,600)	(9,696)
Cash from investing activities - continuing operations	(79,586)	(127,689)	(118,285)
Cash from investing activities - discontinued operations	17,601	15,286	81,999
Net cash used in investing activities	(61,985)	(112,403)	(36,286)
Cash Flows From Financing Activities
Payment of cash dividends	(27,337)	(24,591)	(21,658)
Dividends from discontinued operations	0	0	15,000
Repurchase of common stock	(29,784)	(3,746)	(2,423)
Issuance of common stock	4,828	9,922	5,496
Tax impact from issuance of common stock	0	(816)	(833)
Cash from financing activities - continued operations	(52,293)	(19,231)	(4,418)
Cash from financing activities - discontinued operations	(55,256)	(78,346)	(133,419)
Net cash used in financing activities	(107,549)	(97,577)	(137,837)
Net Change in Cash and Cash Equivalents	560	4,404	15,876
Less: decrease (increase) in cash and cash equivalents - discontinued operations	5,808	(4,706)	6,902
Net increase (decrease) in cash and cash equivalents - continuing operations	6,368	(302)	22,778
Cash and Cash Equivalents at Beginning of Year - Continuing Operations	89,194	89,496	66,718
Cash and Cash Equivalents at End of Year - Continuing Operations	$ 95,562	$ 89,194	$ 89,496