Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 17,194	$ 21,562
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	1,905	2,139
Net amortization of debt securities	528	535
Depreciation and amortization	5,439	4,380
Deferred income tax expense (benefit)	1,932	(1,430)
Net realized investment gains	(4,894)	(2,502)
Net unrealized investment losses	4,157
Other-than-temporary impairment losses	80	390
Income from unconsolidated joint venture	(330)	(142)
Distribution received from unconsolidated joint venture		147
Net income from limited partnership interests	(852)	(1,332)
Distributions received from limited partnership interests	609	426
Loss on repurchases of senior notes		743
Foreign currency remeasurement loss (gain)	115	(51)
Other		116
Changes in operating assets and liabilities:
Accrued interest and dividends receivable	511	(427)
Income taxes	13,084	1,838
Premiums receivable	(8,090)	(9,345)
Prepaid reinsurance premiums	(7,294)	(11,478)
Reinsurance recoverable	7,203
Deferred policy acquisition costs	(3,374)	(3,612)
Other assets	1,520	(6,862)
Losses and loss adjustment expenses	(26,191)	2,597
Unearned premiums	29,932	24,167
Advance premiums	8,202	10,316
Assumed reinsurance balances payable	118	(3,113)
Reinsurance recovered in advance on unpaid losses	(13,885)
Accrued expenses and other liabilities	(28)	2,411
Net cash provided by operating activities	27,591	31,473
Cash flows from investing activities:
Investments in limited partnership interests	(2,638)	(1,489)
Distributions received from limited partnership interests	114	11,758
Distribution from unconsolidated joint venture		417
Purchase of property and equipment	(1,045)	(1,295)
Purchase of real estate investments	(6,520)	(1,931)
Purchase of intangible assets	(409)
Purchase of fixed-maturity securities	(50,976)	(91,354)
Purchase of equity securities	(20,832)	(22,738)
Purchase of short-term investments	(125,001)
Proceeds from sales of fixed-maturity securities	77,769	6,873
Proceeds from calls, repayments and maturities of fixed-maturity securities	27,207	3,937
Proceeds from sales of equity securities	40,436	20,902
Proceeds from sales, redemptions and maturities of short-term investments	15,093
Proceeds from sales of derivative instruments	24
Net cash used in investing activities	(46,778)	(74,920)
Cash flows from financing activities:
Cash dividends paid	(5,011)	(7,026)
Cash dividends received under share repurchase forward contract	590	503
Proceeds from exercise of common stock options		75
Proceeds from issuance of long-term debt		143,859
Repurchases of senior notes		(40,250)
Repayment of long-term debt	(520)	(465)
Repurchases of common stock	(941)	(30,636)
Repurchases of common stock under share repurchase plan	(13,711)	(1,590)
Purchase of non-controlling interest	(539)
Debt issuance costs		(4,975)
Net cash (used in) provided by financing activities	(20,132)	59,495
Effect of exchange rate changes on cash	(112)	50
Net (decrease) increase in cash, cash equivalents, and restricted cash	(39,431)	16,098
Cash, cash equivalents, and restricted cash at beginning of period	256,693	281,131
Cash, cash equivalents, and restricted cash at end of period	217,262	297,229
Supplemental disclosure of cash flow information:
Cash paid for income taxes	43	11,476
Cash paid for interest	5,309	3,620
Non-cash investing and financing activities:
Unrealized (loss) gain on investments in available-for-sale securities, net of tax	(2,441)	346
Conversion of revolving credit facility to long-term debt		9,441
Receivable from sales of equity securities	530
Payable on purchases of equity securities		$ 694
Receivable from maturities of fixed-maturity securities	$ 15,000