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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating Activities    
Net income $ 80,633 $ 73,476
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 30,155 29,085
Stock-based compensation expense 7,203 6,049
Undistributed losses of equity method investments 1,677 2,117
Net realized losses (gains) 939 (15,463)
Changes in assets and liabilities:    
Increase in reserve for loss and loss expenses, net of reinsurance recoverables 41,986 66,609
Increase in unearned premiums, net of prepaid reinsurance 89,109 83,789
Decrease in net federal income taxes 2,380 19,232
Increase in premiums receivable (91,391) (88,813)
Increase in deferred policy acquisition costs (15,395) (17,616)
(Increase) decrease in interest and dividends due or accrued (1,030) 395
Decrease in accrued salaries and benefits (48,603) (18,171)
Increase in other assets (3,877) (743)
(Decrease) increase in other liabilities (34,659) 25,651
Net adjustments (21,506) 92,121
Net cash provided by operating activities 59,127 165,597
Investing Activities    
Purchase of fixed income securities, available-for-sale (411,538) (463,758)
Purchase of fixed income securities, held-to-maturity (4,235) 0
Purchase of equity securities, available-for-sale (16,796) (177,386)
Purchase of other investments (17,734) (2,947)
Purchase of short-term investments (691,496) (732,278)
Sale of fixed income securities, available-for-sale 22,114 22,323
Sale of short-term investments 680,865 695,901
Redemption and maturities of fixed income securities, held-to-maturity 44,615 68,704
Redemption and maturities of fixed income securities, available-for-sale 264,244 254,995
Sale of equity securities, available-for-sale 83,793 135,548
Distributions from other investments 13,380 17,840
Purchase of property and equipment (8,187) (7,591)
Net cash used in investing activities (40,975) (188,649)
Financing Activities    
Dividends to stockholders (16,569) (15,211)
Acquisition of treasury stock (4,419) (3,583)
Net proceeds from stock purchase and compensation plans 4,368 4,037
Proceeds from borrowings 55,000 15,000
Repayments of borrowings (55,000) 0
Excess tax benefits from share-based payment arrangements 1,761 1,549
Repayments of capital lease obligations (2,661) (2,331)
Net cash used in financing activities (17,520) (539)
Net increase in cash 632 (23,591)
Cash, beginning of year 898 23,959
Cash, end of period $ 1,530 $ 368