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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

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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash inflow from sales of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6485959&loc=d3e22529-158502 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 3 -Subparagraph a -Article 7 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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