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Consolidated Statements of Cashflow (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Operating Activities      
Net income $ 37,963 $ 22,033 $ 66,966
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 38,693 34,645 31,770
Loss on disposal of discontinued operations 0 650 3,780
Stock-based compensation expense 6,939 7,422 8,017
Undistributed (income) loss of equity method investments 1,651 (323) (8,712)
Net realized (gains) losses (8,988) (2,240) 7,083
Changes in assets and liabilities:      
Increase in reserves for losses and loss expenses, net of reinsurance recoverables 64,763 56,905 41,526
Increase (decrease) in unearned premiums, net of prepaid reinsurance and advance premiums 82,777 46,334 (26,661)
(Increase) decrease in net federal income taxes (7,812) 372 16,577
(Increase) decrease in premiums receivable (18,094) (45,116) 32,472
(Increase) decrease in deferred policy acquisition costs (19,762) (7,777) 6,781
Decrease (increase) in interest and dividends due or accrued 468 633 (2,361)
Increase (decrease) in accrued salaries and benefits 6,533 1,521 (14,913)
Increase (decrease) in accrued insurance expenses 8,831 (636) (4,470)
Other-net 32,737 8,534 1,330
Net adjustments 188,736 100,924 92,219
Net cash provided by operating activities 226,699 122,957 159,185
Investing Activities      
Purchase of fixed maturity securities, available-for-sale (884,911) (487,813) (1,007,679)
Purchase of equity securities, available-for-sale (83,833) (150,551) (71,192)
Purchase of other investments (12,990) (16,033) (20,673)
Purchase of short-term investments (1,735,691) (1,448,782) (1,741,738)
Purchase of subsidiary, net of cash acquired 255 (51,728) 0
Sale of subsidiary 751 1,152 978
Sale of fixed maturity securities, available-for-sale 103,572 146,435 190,438
Sale of short-term investments 1,738,255 1,433,441 1,794,434
Redemption and maturities of fixed maturity securities, held-to-maturity 118,260 177,350 319,835
Redemption and maturities of fixed maturity securities, available-for-sale 439,957 162,796 298,171
Sale of equity securities, available-for-sale 101,740 60,071 98,015
Distributions from other investments 24,801 25,622 22,406
Sale of other investments 1 16,357 0
Purchase of property, equipment, and other assets (12,879) (11,824) (6,522)
Net cash used in investing activities (202,712) (143,507) (123,527)
Financing Activities      
Dividends to stockholders (26,944) (26,513) (26,056)
Acquisition of treasury stock (3,495) (2,741) (1,686)
Principal payment of notes payable 0 0 (12,300)
Proceeds from borrowings 0 45,000 0
Net proceeds from stock purchase and compensation plans 4,840 5,011 4,962
Excess tax benefits (expense) from share-based payment arrangements 1,060 (90) (744)
Net cash (used in) provided by financing activities (24,539) 20,667 (35,824)
Net (decrease) increase in cash (552) 117 (166)
Cash, beginning of year 762 645 811
Cash, end of year $ 210 $ 762 $ 645