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Parent Corporation Statements of Cash Flows (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Operating Activities      
Net income $ 106,418 $ 37,963 $ 22,033
Adjustments to reconcile net income to net cash provided by operating activities:      
Stock-based compensation expense 8,630 6,939 7,422
Loss on disposal of discontinued operations 997 0 650
Realized gain (20,732) (8,988) (2,240)
Amortization - other 43,461 38,693 34,645
Changes in assets and liabilities:      
Increase in accrued salaries and benefits 18,685 6,533 1,521
(Increase) decrease in net federal income taxes 14,834 (7,812) 372
Other-net (17,802) 32,737 8,534
Net adjustments 229,706 188,736 100,924
Net cash provided by operating activities 336,124 226,699 122,957
Investing Activities      
Purchase of fixed maturity securities, available-for-sale (1,069,387) (884,911) (487,813)
Redemption and maturities of fixed maturity securities, available-for-sale 513,804 439,957 162,796
Redemption and maturities of fixed maturity securities, held-to-maturity 116,584 118,260 177,350
Purchase of short-term investments (2,056,576) (1,735,691) (1,448,782)
Sale of short-term investments 2,096,805 1,738,255 1,433,441
Purchase of subsidiary, net of cash acquired 0 255 (51,728)
Sale of subsidiary 1,225 751 1,152
Net cash used in investing activities (391,025) (202,712) (143,507)
Financing Activities      
Dividends to stockholders (27,416) (26,944) (26,513)
Acquisition of treasury stock (3,716) (3,495) (2,741)
Proceeds from notes payable, net of debt issuance costs 178,435 0 0
Net proceeds from stock purchase and compensation plans 7,119 4,840 5,011
Excess tax benefits (expense) from share-based payment arrangements 1,545 1,060 (90)
Repayment of notes payable (100,000) 0 0
Net cash provided (used in) by financing activities 54,884 (24,539) 20,667
Cash, beginning of year 210 762 645
Cash, end of year 193 210 762
Parent Company [Member]
      
Operating Activities      
Net income 106,418 37,963 22,033
Adjustments to reconcile net income to net cash provided by operating activities:      
Equity In Undistributed Income Of Continuing Subsidiaries Net Of Tax (108,899) 0 0
Dividends in excess of continuing subsidiaries' current year income   131,693 16,195
Stock-based compensation expense 8,630 6,939 7,422
Loss on disposal of discontinued operations 997 0 650
Realized gain 0 (219) 0
Amortization - other 4,353 450 229
Changes in assets and liabilities:      
Increase in accrued salaries and benefits 6,791 5,221 330
(Increase) decrease in net federal income taxes (14,968) 4,897 742
Other-net 1,204 (7,014) (2,234)
Net adjustments (101,892) 141,967 23,334
Net cash provided by operating activities 4,526 179,930 45,367
Investing Activities      
Purchase of fixed maturity securities, available-for-sale (21,708) (148,604) (19,643)
Redemption and maturities of fixed maturity securities, available-for-sale 6,432 127,344 0
Redemption and maturities of fixed maturity securities, held-to-maturity 0 0 796
Purchase of short-term investments (241,748) (106,539) (128,378)
Sale of short-term investments 253,136 113,700 144,538
Capital contribution to subsidiaries (57,125) (139,122) 0
Purchase of subsidiary, net of cash acquired 0 255 (51,728)
Sale of subsidiary 1,225 751 1,152
Net cash used in investing activities (59,788) (152,215) (53,263)
Financing Activities      
Dividends to stockholders (27,416) (26,944) (26,513)
Acquisition of treasury stock (3,716) (3,495) (2,741)
Proceeds from notes payable, net of debt issuance costs 178,435 0 0
Net proceeds from stock purchase and compensation plans 7,119 4,840 5,011
Excess tax benefits (expense) from share-based payment arrangements 1,545 1,060 (90)
Repayment of notes payable (100,000) 0 0
Borrowings from subsidiaries 0 0 45,000
Principal payments of borrowings from subsidiaries (722) (3,688) (12,654)
Net cash provided (used in) by financing activities 55,245 (28,227) 8,013
Net (decrease) increase in cash (17) (512) 117
Cash, beginning of year 210 722 605
Cash, end of year $ 193 $ 210 $ 722