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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Operating Activities    
Net income $ 119,135 $ 120,472
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 45,563 43,868
Stock-based compensation expense 8,950 7,626
Undistributed losses of equity method investments 49 781
Net realized gains (2,749) (15,771)
Changes in assets and liabilities:    
Increase in reserve for loss and loss expenses, net of reinsurance recoverables 90,814 60,065
Increase in unearned premiums, net of prepaid reinsurance 125,453 121,424
Decrease in net federal income taxes 11,534 27,980
Increase in premiums receivable (96,425) (95,188)
Increase in deferred policy acquisition costs (22,775) (28,058)
(Increase) decrease in interest and dividends due or accrued (1,356) 979
Decrease in accrued salaries and benefits (63,753) (338)
Increase in other assets (16,280) (13,888)
(Decrease) increase in other liabilities (20,686) 29,081
Net adjustments 58,339 138,561
Net cash provided by operating activities 177,474 259,033
Investing Activities    
Purchase of fixed income securities, available-for-sale (842,253) (731,154)
Purchase of fixed income securities, held-to-maturity (4,235) 0
Purchase of equity securities, available-for-sale (24,747) (192,717)
Purchase of other investments (34,994) (6,589)
Purchase of short-term investments (1,307,024) (1,084,794)
Sale of fixed income securities, available-for-sale 33,448 22,323
Sale of short-term investments 1,332,239 1,090,911
Redemption and maturities of fixed income securities, held-to-maturity 74,186 79,972
Redemption and maturities of fixed income securities, available-for-sale 483,877 403,510
Sale of equity securities, available-for-sale 99,420 148,228
Distributions from other investments 18,512 22,038
Purchase of property and equipment (13,421) (11,869)
Net cash used in investing activities (184,992) (260,141)
Financing Activities    
Dividends to stockholders (24,885) (22,848)
Acquisition of treasury stock (4,985) (3,887)
Net proceeds from stock purchase and compensation plans 4,906 6,016
Proceeds from borrowings 105,000 15,000
Repayments of borrowings (70,000) 0
Excess tax benefits from share-based payment arrangements 1,917 1,498
Repayments of capital lease obligations (3,840) (3,517)
Net cash provided by (used in) financing activities 8,113 (7,738)
Net increase (decrease) in cash 595 (8,846)
Cash, beginning of year 898 23,959
Cash, end of period $ 1,493 $ 15,113