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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 $ 144,877 $ 73,044 $ 74,479
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 55,343 53,258 47,838
Net realized investment (gains) losses (83,650) 34,255 83,807
Increase in premiums receivable (14,908) (22,531) (41,512)
Change in reinsurance recoverables (43,043) 998 (89)
Gain on sale of fixed assets (3,078) 0 0
Changes in current and deferred income taxes (3,010) (2,130) (35,287)
Decrease (increase) in deferred policy acquisition costs 2,675 936 (4,560)
Increase in loss and loss adjustment expense reserves 220,365 143,560 36,214
Increase in unearned premiums 27,490 25,124 42,552
Decrease in accounts payable and accrued expenses (4,178) (10,586) (35,086)
Share-based compensation 60 142 142
Other, net 42,462 (4,392) 21,773
Net cash provided by operating activities 341,405 291,678 190,271
CASH FLOWS FROM INVESTING ACTIVITIES      
Fixed maturity securities available-for-sale in nature: Purchases (734,397) (1,077,638) (965,701)
Fixed maturity securities available-for-sale in nature: Sales 100,709 396,766 260,946
Calls or maturities 575,735 647,059 386,644
Equity securities available for sale in nature:      
Purchases (831,310) (714,113) (748,217)
Sales 679,571 696,138 805,417
Calls 7,100 0 2,851
Changes in securities payable and receivable (44,740) 29,958 (1,387)
Changes in short-term investments and purchased options 73,005 (191,530) 187,492
Purchase of fixed assets (19,443) (16,979) (20,112)
Sale of fixed assets 6,239 14 141
Business acquisition, net of cash acquired 0 0 7,771
Other, net 1,934 3,605 2,473
Net cash used in investing activities (185,597) (226,720) (81,682)
CASH FLOWS FROM FINANCING ACTIVITIES      
Dividends paid to shareholders (137,886) (137,201) (136,386)
Employee taxes paid with shares related to share-based compensation 0 (3,292) 0
Proceeds from stock options exercised 2,162 1,632 2,111
Net proceeds from issuance of senior notes 371,011 0 0
Payoff of principal on loan and credit facilities (320,000) 0 0
Proceeds from bank loan 0 30,000 0
Net cash used in financing activities (84,713) (108,861) (134,275)
Net increase (decrease) in cash 71,095 (43,903) (25,686)
Cash:      
Beginning of year 220,318 264,221 289,907
End of year 291,413 220,318 264,221
SUPPLEMENTAL CASH FLOW DISCLOSURE      
Interest paid 9,863 3,531 2,989
Income taxes paid $ 25,218   $ 31,390
Income taxes (refunded)   $ (183)