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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Operating Activities    
Net income $ 18,925 $ 50,440
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 11,200 12,882
Stock-based compensation expense 5,820 5,273
Undistributed gains of equity method investments (881) (685)
Distributions in excess of current year income of equity method investments 1,346 465
Loss on disposal of fixed assets 29 998
Net realized and unrealized losses 10,549 1,045
Changes in assets and liabilities:    
Increase in reserve for loss and loss expense, net of reinsurance recoverable 54,766 28,903
Increase in unearned premiums, net of prepaid reinsurance 32,732 37,850
Decrease in net federal income taxes 3,616 16,946
Increase in premiums receivable (19,284) (26,066)
Increase in deferred policy acquisition costs (4,237) (5,058)
Increase in interest and dividends due or accrued (864) (218)
Decrease in accrued salaries and benefits (41,363) (36,558)
Increase in other assets (9,672) (6,511)
Decrease in other liabilities (70,387) (55,175)
Net cash (used in) provided by operating activities (7,705) 24,531
Investing Activities    
Purchase of fixed income securities, available-for-sale (875,016) (724,880)
Purchase of equity securities (38,273)  
Purchase of equity securities, available-for-sale   (14,083)
Purchase of other investments (13,471) (11,211)
Purchase of short-term investments (754,524) (1,027,885)
Sale of fixed income securities, available-for-sale 675,396 594,805
Sale of short-term investments 737,097 1,010,917
Redemption and maturities of fixed income securities, held-to-maturity 484 16,527
Redemption and maturities of fixed income securities, available-for-sale 160,514 116,357
Sale of equity securities 40,740  
Sale of equity securities, available-for-sale   5,503
Sale of other investments 3,497 0
Distributions from other investments 6,221 5,983
Purchase of property and equipment (2,120) (4,937)
Net cash used in investing activities (59,455) (32,904)
Financing Activities    
Dividends to stockholders (10,203) (8,955)
Acquisition of treasury stock (6,116) (5,572)
Net proceeds from stock purchase and compensation plans 1,435 1,563
Proceeds from borrowings 130,000 64,000
Repayments of borrowings (75,000) (64,000)
Repayments of capital lease obligations (734) (1,147)
Net cash provided by (used in) financing activities 39,382 (14,111)
Net decrease in cash and restricted cash (27,778) (22,484)
Cash and restricted cash, beginning of year 44,710 37,405
Cash and restricted cash, end of period $ 16,932 $ 14,921