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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Operating Activities    
Net income $ 37,032 $ 39,708
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 14,627 14,041
Stock-based compensation expense 4,377 3,681
Undistributed losses of equity method investments 1,066 3,541
Net realized gains 2,704 (18,883)
Changes in assets and liabilities:    
Increase in reserve for loss and loss expenses, net of reinsurance recoverables 42,390 44,964
Increase in unearned premiums, net of prepaid reinsurance 42,901 41,966
Decrease in net federal income taxes 5,296 11,034
Increase in premiums receivable (39,180) (38,110)
Increase in deferred policy acquisition costs (7,789) (6,348)
Decrease in interest and dividends due or accrued 528 510
Decrease in accrued salaries and benefits (27,115) (16,290)
Increase in other assets (10,128) (5,578)
Decrease in other liabilities (52,902) (13,662)
Net adjustments (23,225) 20,866
Net cash provided by operating activities 13,807 60,574
Investing Activities    
Purchase of fixed income securities, available-for-sale (264,828) (238,000)
Purchase of equity securities, available-for-sale (7,574) (150,500)
Purchase of other investments (12,723) (1,724)
Purchase of short-term investments (303,228) (333,550)
Sale of fixed income securities, available-for-sale 12,905 9,305
Sale of short-term investments 394,915 341,146
Redemption and maturities of fixed income securities, held-to-maturity 37,400 20,720
Redemption and maturities of fixed income securities, available-for-sale 130,641 145,661
Sale of equity securities, available-for-sale 4,285 129,052
Distributions from other investments 7,994 5,845
Purchase of property and equipment (3,439) (4,064)
Net cash used in investing activities (3,652) (76,109)
Financing Activities    
Dividends to stockholders (8,270) (7,591)
Acquisition of treasury stock (3,845) (3,580)
Net proceeds from stock purchase and compensation plans 1,478 2,271
Proceeds from borrowings 25,000 15,000
Repayments of borrowings (25,000) 0
Excess tax benefits from share-based payment arrangements 1,361 1,398
Repayments of capital lease obligations (1,094) (1,118)
Net cash provided by financing activities (10,370) 6,380
Net decrease in cash (215) (9,155)
Cash, beginning of year 898 23,959
Cash, end of period $ 683 $ 14,804