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Schedule - Parent Corporation Financial Statements (Statements of Cash Flows) (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Operating Activities      
Net income $ 19,865 $ 65,541 $ 36,398
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation expense 7,422 8,017 11,256
Loss on disposal of discontinued operations 650 3,780 1,174
Changes in assets and liabilities:      
Decrease increase in accrued salaries and benefits 1,521 (14,913) (15,240)
Increase Decrease In Income Taxes (1,403) 15,809 (3,718)
Other-net 9,142 1,330 6,050
Net adjustments 103,092 93,644 191,161
Net Cash Provided by (Used in) Operating Activities 122,957 159,185 227,559
Investing Activities      
Purchase of fixed maturity securities, available-for-sale (487,813) (1,007,679) (1,041,277)
Redemption and maturities of fixed maturity securities, held-to-maturity 177,350 319,835 282,310
Purchase of short-term investments (1,448,782) (1,741,738) (1,956,164)
Sale of short-term investments 1,433,441 1,794,434 1,940,427
Purchase of subsidiary, net of cash acquired (51,728) 0 0
Sale of subsidiary 1,152 978 (12,538)
Net cash used in investing activities (143,507) (123,527) (220,197)
Financing Activities      
Dividends to stockholders (26,513) (26,056) (26,296)
Acquisition of treasury stock (2,741) (1,686) (3,010)
Principal payment of notes payable 0 (12,300) (12,300)
Net proceeds from stock purchase and compensation plans 5,011 4,962 4,612
Excess tax benefits from share-based payment arrangements (90) (744) (1,200)
Net cash provided by (used in) financing activities 20,667 (35,824) (25,194)
Net increase in cash 117 (166) (2,795)
Cash from continuing operations, beginning of year 645 811 3,606
Cash from continuing operations, end of period 762 645 811
Parent Company [Member]
      
Operating Activities      
Net income 19,865 65,541 36,398
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed income of subsidiaries, net of tax 0 (45,235) (37,846)
Dividends in excess of continuing subsidiaries' current year earnings 18,363 0 0
Stock-based compensation expense 7,422 12,355 11,036
Loss on disposal of discontinued operations 650 3,780 1,174
Amortization - other 229 149 208
Changes in assets and liabilities:      
Decrease increase in accrued salaries and benefits 330 (1,838) (7,007)
Increase Decrease In Income Taxes 742 4,261 2,745
Other-net (2,234) (1,287) 3,478
Net adjustments 25,502 (27,815) (26,212)
Net Cash Provided by (Used in) Operating Activities 45,367 37,726 10,186
Investing Activities      
Purchase of fixed maturity securities, available-for-sale (19,643) 0 0
Redemption and maturities of fixed maturity securities, held-to-maturity 796 513 236
Purchase of short-term investments (128,378) (110,807) (232,823)
Sale of short-term investments 144,538 108,565 245,165
Capital contribution to subsidiaries 0 0 (20,000)
Purchase of subsidiary, net of cash acquired (51,728) 0 0
Sale of subsidiary 1,152 978 (581)
Distributions of capital by subsidiaries 0 0 680
Net cash used in investing activities (53,263) (751) (7,323)
Financing Activities      
Dividends to stockholders (26,513) (26,056) (26,296)
Acquisition of treasury stock (2,741) (1,686) (3,010)
Principal payment of notes payable 0 (12,300) (12,300)
Net proceeds from stock purchase and compensation plans 5,011 4,962 4,612
Excess tax benefits from share-based payment arrangements (90) (744) (1,200)
Borrowings from subsidiaries 45,000 0 36,000
Principal payments of borrowings from subsidiaries (12,654) (623) (592)
Net cash provided by (used in) financing activities 8,013 (36,447) (2,786)
Net increase in cash 117 528 77
Cash from continuing operations, beginning of year 605 77 0
Cash from continuing operations, end of period $ 722 $ 605 $ 77