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Consolidated Statements of Cash Flow - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating Activities    
Net income $ 77,744 $ 91,866
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 21,771 25,409
Stock-based compensation expense 9,636 8,372
Undistributed gains of equity method investments (1,628) (3,584)
Distributions in excess of current year income of equity method investments 1,450 552
Loss on disposal of fixed assets 29 998
Net realized and unrealized losses (gains) 12,201 (689)
Changes in assets and liabilities:    
Increase in reserve for loss and loss expense, net of reinsurance recoverable 82,978 59,152
Increase in unearned premiums, net of prepaid reinsurance 83,143 83,633
Decrease in net federal income taxes 9,887 7,263
Increase in premiums receivable (74,144) (82,729)
Increase in deferred policy acquisition costs (13,412) (12,339)
Decrease (increase) in interest and dividends due or accrued 2 (204)
Decrease in accrued salaries and benefits (46,478) (29,703)
Increase in other assets (6,550) (3,862)
Decrease in other liabilities (64,372) (48,684)
Net cash provided by operating activities 92,257 95,451
Investing Activities    
Purchase of fixed income securities, held-to-maturity (3,650) 0
Purchase of fixed income securities, available-for-sale (1,331,607) (1,194,142)
Purchase of equity securities (46,402)  
Purchase of equity securities, available-for-sale   (22,115)
Purchase of other investments (26,032) (22,121)
Purchase of short-term investments (1,462,238) (2,259,305)
Sale of fixed income securities, available-for-sale 938,276 717,072
Sale of short-term investments 1,463,726 2,348,892
Redemption and maturities of fixed income securities, held-to-maturity 3,654 28,730
Redemption and maturities of fixed income securities, available-for-sale 311,590 300,430
Sale of equity securities 43,590  
Sale of equity securities, available-for-sale   6,289
Sale of other investments 3,497 0
Distributions from other investments 15,927 9,300
Purchase of property and equipment (6,733) (7,047)
Net cash used in investing activities (96,402) (94,017)
Financing Activities    
Dividends to stockholders (20,437) (17,922)
Acquisition of treasury stock (6,245) (5,948)
Net proceeds from stock purchase and compensation plans 3,930 4,045
Proceeds from borrowings 130,000 64,000
Repayments of borrowings (130,000) (64,000)
Repayments of capital lease obligations (1,333) (2,254)
Net cash used in financing activities (24,085) (22,079)
Net decrease in cash and restricted cash (28,230) (20,645)
Cash and restricted cash, beginning of year 44,710 37,405
Cash and restricted cash, end of period $ 16,480 $ 16,760