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Consolidated Statements of Cashflows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Activities      
Net income $ 168,826 $ 158,495 $ 165,861
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 52,100 61,671 59,688
Stock-based compensation expense 12,089 10,449 8,973
Undistributed (gains) losses of equity method investments (6,393) (2,316) 1,889
Net realized (gains) losses (6,359) 4,937 (13,171)
Loss on disposal of fixed assets 998 0 0
Changes in assets and liabilities:      
Increase in reserves for loss and loss expense, net of reinsurance recoverables 106,226 114,422 59,438
Increase in unearned premiums, net of prepaid reinsurance 79,614 87,716 79,995
Decrease in net federal income taxes 30,918 11,150 25,004
Increase in premiums receivable (65,418) (66,447) (56,386)
Increase in deferred policy acquisition costs (12,491) (9,405) (27,551)
(Increase) decrease in interest and dividends due or accrued (1,088) (1,473) 407
(Decrease) increase in accrued salaries and benefits (5,714) (46,536) 11,392
Increase in other assets (9,872) (30,071) (11,523)
Increase in other liabilities 27,297 9,191 77,564
Net cash provided by operating activities 370,733 301,783 381,580
Investing Activities      
Purchase of fixed income securities, held-to-maturity 0 (4,235) (3,316)
Purchase of fixed income securities, available-for-sale (2,130,362) (1,982,023) (1,041,916)
Purchase of equity securities, available-for-sale (61,931) (35,490) (195,720)
Purchase of other investments (55,830) (66,164) (12,170)
Purchase of short-term investments (4,280,553) (3,499,380) (1,602,327)
Sale of fixed income securities, available-for-sale 1,197,920 926,470 61,571
Sale of short-term investments 4,338,318 3,470,022 1,539,480
Redemption and maturities of fixed income securities, held-to-maturity 58,832 102,868 106,621
Redemption and maturities of fixed income securities, available-for-sale 555,216 641,524 567,445
Sale of equity securities, available-for-sale 37,960 119,617 172,561
Distributions from other investments 23,426 26,837 32,457
Purchase of property and equipment (14,071) (18,147) (16,229)
Net cash used in investing activities (331,075) (318,101) (391,543)
Financing Activities      
Dividends to stockholders (37,045) (33,758) (31,052)
Acquisition of treasury stock (6,015) (4,992) (4,182)
Net proceeds from stock purchase and compensation plans 7,599 7,811 10,089
Proceeds from borrowings 84,000 165,000 15,000
Repayment of borrowings (84,000) (115,000) 0
Excess tax benefits from share-based payment arrangements 0 1,819 1,736
Repayment of capital lease obligations (4,121) (5,002) (4,689)
Net cash (used in) provided by financing activities (39,582) 15,878 (13,098)
Net increase (decrease) in cash 76 (440) (23,061)
Cash, beginning of year 458 898 23,959
Cash, end of year $ 534 $ 458 $ 898