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Schedule II - Condensed Financial Information of Registrant Condensed Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net Income | $ 57,798 | $ 86,248 | $ 42,933
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Depreciation, Depletion and Amortization, Nonproduction | 18,404 | 18,970 | 11,580
Net realized gains on investments, excluding other than temporary impairment (OTTI) losses | 6,454 | 18,641 | (23,726)
Loss on Extinguishment of Debt | 0 | 0 | (292)
Share-based Compensation | 6,552 | 9,339 | 11,993
Employee Stock Ownership Plan (ESOP), Compensation Expense | 1,100 | 1,300 | 800
Deferred Income Tax Expense (Benefit) | (52,336) | (80,869) | (118,048)
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] |  |  |
Increase (Decrease) in Other Operating Assets | (7,090) | 5,005 | (26,516)
Change in other liabilities | 5,927 | (77,082) | 64,776
Net Cash Provided by (Used in) Operating Activities | 784,314 | 277,791 | 420,475
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Payments to Acquire Property, Plant, and Equipment | (738) | (5,265) | (5,318)
Net Cash Provided by (Used in) Investing Activities | (2,129,490) | (3,605,833) | (3,116,388)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Repayments of Notes Payable | 0 | (46,251) | (156,641)
Purchase of 2015 notes hedges | 0 | 0 | (37,000)
Repayment of subordinated debentures | (1,141) | 0 | 0
Excess tax benefits realized from share-based compensation plans | 481 | 1,061 | 480
Proceeds from Issuance of Common Stock | 5,741 | 4,686 | 6,124
Proceeds from Issuance of Warrants | 0 | 0 | 15,600
Payments of Financing Costs | 0 | (1,566) | (6,800)
Payments of Dividends, Common Stock | 9,203 | 6,916 | 5,643
Net cash provided by financing activities | 2,208,769 | 3,135,228 | 2,765,677
Proceeds from Notes Payable | 0 | 0 | 200,000
Cash and Cash Equivalents, Period Increase (Decrease) | 863,593 | (192,814) | 69,764
Cash and cash equivalents at beginning of period | 404,952 | 597,766 | 528,002
Cash and cash equivalents at end of period | 1,268,545 | 404,952 | 597,766
Supplemental Cash Flow Information [Abstract] |  |  |
Interest expense | 27,666 | 30,650 | 25,802
Non cash financing activities: [Abstract] |  |  |
Conversion of subordinated debentures | 19,591 |  | 56
Parent Company [Member] |  |  |
Net Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
Net Income | 57,798 | 86,248 | 42,933
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] |  |  |
2015 Notes Embedded Derivatives, Gain (Loss), Net | (2,488) | (21,002) | 29,595
Depreciation, Depletion and Amortization, Nonproduction | 2,382 | 2,395 | 1,270
Accrual of Discount on Equity Securities | (5) | (5) | (4)
Equity in Undistributed Income of Subsidiaries | (65,777) | (97,314) | (52,832)
Accretion (Amortization) of Discounts and Premiums, Investments | 0 | 1,005 | 185
2015 Notes Hedges, Gain (Loss), Net | 7,472 | 21,002 | (29,595)
Net realized gains on investments, excluding other than temporary impairment (OTTI) losses | 0 | (18) | (13)
Loss on Extinguishment of Debt | 0 | 0 | (292)
Accrual of Discount on Debenture Issued to Subsidiary Trust | 110 | 158 | 148
Amortization of Debt Discount (Premium) | 12,261 | 13,024 | 7,761
Share-based Compensation | 1,348 | 866 | 1,087
Employee Stock Ownership Plan (ESOP), Compensation Expense | 45 | 45 | 82
Deferred Income Tax Expense (Benefit) | (2,838) | (4,355) | (5,153)
Increase (Decrease) in Other Operating Assets and Liabilities, Net [Abstract] |  |  |
Increase (Decrease) in Accounts Receivable, Related Parties | 1,205 | 1,596 | (10)
Increase (Decrease) in Income Taxes Receivable | (2,745) | 142 | (2,296)
Increase (Decrease) in Other Operating Assets | (549) | 1,702 | (1,925)
Change in other liabilities | (4,469) | (1,562) | 3,708
Net Cash Provided by (Used in) Operating Activities | 3,750 | 3,927 | (4,767)
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Capital Contributions to Subsidiaries | 0 | (2,450) | (2,400)
Payments to Acquire Available-for-sale Securities | 0 | (53,610) | (50,260)
Proceeds from Sale of Available-for-sale Securities | 0 | 52,623 | 50,088
Payments to Acquire Property, Plant, and Equipment | 0 | 0 | (33)
Net Cash Provided by (Used in) Investing Activities | 0 | (3,437) | (2,605)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Repayments of Notes Payable | 0 | (46,251) | (156,641)
Purchase of 2015 notes hedges | 0 | 0 | (37,000)
Repayment of subordinated debentures | (1,141) | 0 | 0
Excess tax benefits realized from share-based compensation plans | 6 | 28 | 31
Proceeds from Issuance of Common Stock | 5,370 | 4,686 | 6,123
Proceeds from Issuance of Warrants | 0 | 0 | 15,600
Payments of Financing Costs | 0 | (1,566) | (6,800)
Payments of Dividends, Common Stock | (9,374) | (7,102) | (5,829)
Net cash provided by financing activities | (5,139) | (50,205) | 15,484
Proceeds from Notes Payable | 0 | 0 | 200,000
Cash and Cash Equivalents, Period Increase (Decrease) | (1,389) | (49,715) | 8,112
Cash and cash equivalents at beginning of period | 12,609 | 62,324 | 54,212
Cash and cash equivalents at end of period | 11,220 | 12,609 | 62,324
Non cash financing activities: [Abstract] |  |  |
Conversion of subordinated debentures | 20,770 | 0 | 60
Convertible Notes Payable [Member] | Parent Company [Member] |  |  |
Supplemental Cash Flow Information [Abstract] |  |  |
Interest expense | 14,564 | 16,917 | 11,085
Convertible Subordinated Debt [Member] | Parent Company [Member] |  |  |
Supplemental Cash Flow Information [Abstract] |  |  |
Interest expense | $ 13,102 | $ 13,703 | $ 14,717

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- Definition This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Article 5 + Details
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