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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities      
Net income $ 178,939 $ 168,826 $ 158,495
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 44,874 52,100 61,671
Stock-based compensation expense 14,507 12,089 10,449
Undistributed (gains) losses of equity method investments (8,341) (5,362) 318
Distributions in excess of current year income of equity method investments 2,924 552 0
Net realized and unrealized losses (gains) 54,923 (6,359) 4,937
Loss on disposal of fixed assets 63 998 0
Changes in assets and liabilities:      
Increase in reserves for loss and loss expense, net of reinsurance recoverables 168,288 106,226 114,422
Increase in unearned premiums, net of prepaid reinsurance 78,058 79,614 87,716
Decrease in net federal income taxes 2,428 30,918 11,150
Increase in premiums receivable (23,489) (65,418) (66,447)
Increase in deferred policy acquisition costs (17,557) (12,491) (9,405)
Increase in interest and dividends due or accrued (540) (1,088) (1,473)
Decrease in accrued salaries and benefits (26,418) (5,714) (46,536)
Increase in other assets (372) (2,643) (4,979)
(Decrease) increase in other liabilities (13,343) 27,297 9,191
Net cash provided by operating activities 454,944 379,545 329,509
Investing Activities      
Purchase of fixed income securities, held-to-maturity (7,150) 0 (4,235)
Purchase of fixed income securities, available-for-sale (2,918,203) (2,130,362) (1,982,023)
Purchase of equity securities, available-for-sale   (61,931) (35,490)
Purchase of equity securities (94,344)    
Purchase of other investments (68,578) (55,830) (66,164)
Purchase of short-term investments (4,259,734) (4,280,553) (3,499,380)
Sale of fixed income securities, available-for-sale 2,030,664 1,197,920 926,470
Sale of short-term investments 4,101,530 4,338,318 3,470,022
Redemption and maturities of fixed income securities, held-to-maturity 12,106 58,832 102,868
Redemption and maturities of fixed income securities, available-for-sale 638,916 555,216 641,524
Sale of equity securities, available-for-sale   37,960 119,617
Sale of equity securities 113,339    
Sale of other investments 3,497 0 0
Distributions from other investments 28,379 21,843 24,202
Purchase of property and equipment (16,110) (14,071) (18,147)
Net cash used in investing activities (435,688) (332,658) (320,736)
Financing Activities      
Dividends to stockholders (42,097) (37,045) (33,758)
Acquisition of treasury stock (6,556) (6,015) (4,992)
Net proceeds from stock purchase and compensation plans 7,252 7,599 7,811
Proceeds from borrowings 130,000 84,000 165,000
Repayment of borrowings (130,000) (84,000) (115,000)
Excess tax benefits from share-based payment arrangements 0 0 1,819
Repayment of capital lease obligations (5,646) (4,121) (5,002)
Net cash (used in) provided by financing activities (47,047) (39,582) 15,878
Net (decrease) increase in cash and restricted cash (27,791) 7,305 24,651
Cash and restricted cash, beginning of year 44,710 37,405 12,754
Cash and restricted cash, end of year $ 16,919 $ 44,710 $ 37,405