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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified | 6 Months Ended
--- | ---
Jun. 30, 2012 | Jun. 30, 2011
CASH FLOWS FROM OPERATING ACTIVITIES |  |
Net income | $ 68,092 | $ 115,477
Adjustments to reconcile net income to net cash provided by operating activities [Abstract] |  |
Depreciation and amortization | 18,700 | 20,574
Net realized investment gains | (28,904) | (52,454)
Bond amortization, net | 3,981 | 2,704
Excess tax benefit from exercise of stock options | (116) | (32)
Increase in premiums receivables | (28,639) | (6,026)
Change in current and deferred income taxes | (13,878) | 45,546
Increase in deferred policy acquisition costs | (7,685) | (973)
Decrease in unpaid losses and loss adjustment expenses | (6,958) | (53,221)
Increase in unearned premiums | 39,014 | 13,861
Increase in accounts payable and accrued expenses | 6,343 | 5,021
Share-based compensation | (85) | 314
Increase in other payables | 1,611 | 2,113
Other, net | (2,095) | 154
Net cash provided by operating activities | 49,381 | 93,058
CASH FLOWS FROM INVESTING ACTIVITIES |  |
Purchases | (260,626) | (183,740)
Sales | 56,117 | 149,716
Calls or maturities | 189,772 | 150,979
Equity securities available-for-sale in nature: |  |
Purchases | (144,919) | (230,301)
Sales | 75,024 | 191,342
Calls | 923 | 0
Net (decrease) increase in payable for securities | (3,348) | 14,595
Net decrease in short-term investments | 56,301 | 3,826
Purchase of fixed assets | (7,775) | (9,584)
Sale of fixed assets | 1,393 | 2,453
Other, net | 1,610 | 6,436
Net cash (used in) provided by investing activities | (35,528) | 95,722
CASH FLOWS FROM FINANCING ACTIVITIES |  |
Dividends paid to shareholders | (66,973) | (65,784)
Excess tax benefit from exercise of stock options | 116 | 32
Proceeds from stock options exercised | 2,098 | 641
Net cash used in financing activities | (64,759) | (65,111)
Net (decrease) increase in cash | (50,906) | 123,669
Cash: |  |
Beginning of the year | 211,393 | 181,388
End of period | 160,487 | 305,057
SUPPLEMENTAL CASH FLOW DISCLOSURE |  |
Interest paid | 927 | 3,282
Income taxes paid (received) | $ 28,927 | $ (8,499)

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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration