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Parent Corporation Statements of Cash Flows (Details) (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:      
Stock-based compensation expense 6,939 7,422 8,017
Loss on disposal of discontinued operations 0 650 3,780
Realized gain (8,988) (2,240) 7,083
Amortization - other 38,693 34,645 31,770
Changes in assets and liabilities:      
Increase (decrease) in accrued salaries and benefits 6,533 1,521 (14,913)
Decrease in net federal income taxes (7,812) 372 16,577
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)
Redemption and maturities of fixed maturity securities, held-to-maturity 118,260 177,350 319,835
Purchase of short-term investments (1,735,691) (1,448,782) (1,741,738)
Sale of short-term investments 1,738,255 1,433,441 1,794,434
Purchase of subsidiary, net of cash acquired 255 (51,728) 0
Sale of subsidiary 751 1,152 978
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)
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)
Cash, beginning of year 762 645 811
Cash, end of year 210 762 645
Parent Company [Member]
      
Operating Activities      
Net income 37,963 22,033 66,966
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity in undistributed income of subsidiaries, net of tax 0 0 (46,660)
Dividends in excess of continuing subsidiaries' current year income 131,693 16,195 0
Stock-based compensation expense 6,939 7,422 8,017
Loss on disposal of discontinued operations 0 650 3,780
Realized gain (219) 0 0
Amortization - other 450 229 149
Changes in assets and liabilities:      
Increase (decrease) in accrued salaries and benefits 5,221 330 2,500
Decrease in net federal income taxes 4,897 742 4,261
Other-net (7,014) (2,234) (1,287)
Net adjustments 141,967 23,334 (29,240)
Net cash provided by operating activities 179,930 45,367 37,726
Investing Activities      
Purchase of fixed maturity securities, available-for-sale (148,604) (19,643) 0
Redemption and maturities of fixed maturity securities, held-to-maturity 127,344 796 513
Purchase of short-term investments (106,539) (128,378) (110,807)
Sale of short-term investments 113,700 144,538 108,565
Capital contribution to subsidiaries (139,122) 0 0
Purchase of subsidiary, net of cash acquired 255 (51,728) 0
Sale of subsidiary 751 1,152 978
Net cash used in investing activities (152,215) (53,263) (751)
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)
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)
Borrowings from subsidiaries 0 45,000 0
Principal payments of borrowings from subsidiaries (3,688) (12,654) (623)
Net cash (used in) provided by financing activities (28,227) 8,013 (36,447)
Net (decrease) increase in cash (512) 117 528
Cash, beginning of year 722 605 77
Cash, end of year $ 210 $ 722 $ 605