Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Net Income	$ 40,494	$ 82,726	$ 81,057
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation & Amortization	3,645	5,429	5,386
Share-Based Compensation	13,829	17,624	14,997
Deferred Income Taxes	(8,879)	(5,755)	7,004
Net Realized Gains	(45,073)	(9,186)	(8,373)
Net Other-Than-Temporary Impairments Recognized in Earnings	2,064	150	1,698
Changes in Assets And Liabilities:
Reinsurance Recoverable on Paid and Unpaid Losses and Loss Adjustment Expenses	(20,399)	(2,835)	43,822
Reserves for Losses and Loss Adjustment Expenses	225,132	87,083	43,010
Prepaid Reinsurance Premiums	(15,168)	19,211	5,264
Unearned Premiums	100,160	66,668	54,509
Premiums Receivable	(45,035)	(30,070)	65,863
Deferred Policy Acquisition Costs	(15,552)	(27,677)	(12,531)
Accrued Investment Income	(2,139)	(1,314)	(1,210)
Reinsurance Balances Payable	27,362	1,568	(45,124)
Current Income Tax Receivable, Net	3,966	(1,988)	(8,072)
Other	936	27,791	(13,654)
Net Cash Provided by Operating Activities	265,343	229,425	233,646
Fixed Maturities
Redemptions and Maturities	373,380	275,706	180,876
Sales	225,962	446,666	376,522
Purchases	(1,008,537)	(962,419)	(648,059)
Equity Securities
Sales	207,838	54,798	96,405
Purchases	(62,887)	(92,329)	(215,405)
Change in Net Payable for Securities	2,135	(1,517)	1,851
Purchase of Other Invested Assets	0	(1,960)	0
Net Change in Short-Term Investments	17,877	73,541	(38,468)
Purchase of Property and Equipment	(3,474)	(3,918)	(3,577)
Net Cash Used in Investing Activities	(247,706)	(211,432)	(249,855)
Financing Activities:
Proceeds from Employee Stock Purchase Plan	2,076	1,840	1,352
Proceeds of Stock Issued from Exercise of Stock Options	0	0	29
Payment of Employee Tax Withholding on Stock Compensation	(13,887)	(5,198)	(6,022)
Dividends Paid	(6,633)	(3,930)	0
Net Cash Used in Financing Activities	(18,444)	(7,288)	(4,641)
Effect of Exchange Rate on Cash	3,248	(15,963)	0
Change in Cash	2,441	(5,258)	(20,850)
Cash at Beginning of Year	64,643	69,901	90,751
Cash at End of Period	67,084	64,643	69,901
Supplemental Information:
Income Taxes Paid, Net	39,689	34,830	35,447
Interest Paid	15,238	15,238	15,238
Issuance of Stock to Directors	$ 578	$ 633	$ 563