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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Operating Activities    
Net income $ 138,584 $ 119,135
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 38,163 45,563
Stock-based compensation expense 10,139 8,950
Undistributed (gains) losses of equity method investments (5,157) 49
Loss on disposal of fixed assets 998 0
Net realized gains (7,487) (2,749)
Changes in assets and liabilities:    
Increase in reserve for losses and loss expenses, net of reinsurance recoverable 104,429 90,814
Increase in unearned premiums, net of prepaid reinsurance 115,855 125,453
Decrease in net federal income taxes 15,674 11,534
Increase in premiums receivable (88,175) (96,425)
Increase in deferred policy acquisition costs (19,592) (22,775)
Increase in interest and dividends due or accrued (1,088) (1,356)
Decrease in accrued salaries and benefits (19,804) (63,753)
Decrease (increase) in other assets 12,678 (16,280)
Increase (decrease) in other liabilities 12,621 (20,686)
Net cash provided by operating activities 307,838 177,474
Investing Activities    
Purchase of fixed-income securities, held-to-maturity 0 (4,235)
Purchase of fixed income securities, available-for-sale (1,517,474) (842,253)
Purchase of equity securities, available-for-sale (44,480) (24,747)
Purchase of other investments (34,586) (34,994)
Purchase of short-term investments (3,025,824) (1,307,024)
Sale of fixed income securities, available-for-sale 811,991 33,448
Sale of short-term investments 3,032,802 1,332,239
Redemption and maturities of fixed income securities, held-to-maturity 36,092 74,186
Redemption and maturities of fixed income securities, available-for-sale 439,616 483,877
Sale of equity securities, available-for-sale 19,007 99,420
Distributions from other investments 18,503 18,512
Purchase of property and equipment (11,806) (13,421)
Net cash used in investing activities (276,159) (184,992)
Financing Activities    
Dividends to stockholders (26,915) (24,885)
Acquisition of treasury stock (6,005) (4,985)
Net proceeds from stock purchase and compensation plans 4,744 4,906
Proceeds from borrowings 64,000 105,000
Repayments of borrowings (64,000) (70,000)
Excess tax benefits from share-based payment arrangements 0 1,917
Repayments of capital lease obligations (3,267) (3,840)
Net cash (used in) provided by financing activities (31,443) 8,113
Net increase in cash 236 595
Cash, beginning of year 458 898
Cash, end of period $ 694 $ 1,493