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Schedule II Condensed Financial Information (Details) (USD $) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Assets |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities available-for-sale | $ 22,291,614,000 |  |  |  | $ 16,200,950,000 |  |  |  | $ 22,291,614,000 | $ 16,200,950,000 |  |
Short-term investments | 288,082,000 |  |  |  | 88,566,000 |  |  |  | 288,082,000 | 88,566,000 |  |
Cash and cash equivalents | 1,259,892,000 |  |  |  | 962,870,000 |  |  |  | 1,259,892,000 | 962,870,000 | 463,661,000 |
Other assets | 390,757,000 |  |  |  | 332,466,000 |  |  |  | 390,757,000 | 332,466,000 |  |
Total assets | 40,360,438,000 |  |  |  | 31,633,973,000 |  |  |  | 40,360,438,000 | 31,633,973,000 |  |
Liabilities and Stockholders Equity |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities | 742,249,000 |  |  |  | 810,775,000 |  |  |  | 742,249,000 | 810,775,000 |  |
Total stockholders equity | 6,910,187,000 |  |  |  | 5,818,698,000 |  |  |  | 6,910,187,000 | 5,818,698,000 | 4,765,406,000 | 3,639,754,000
Total liabilities and stockholders equity | 40,360,438,000 |  |  |  | 31,633,973,000 |  |  |  | 40,360,438,000 | 31,633,973,000 |  |
CONSOLIDATED STATEMENTS OF INCOME |  |  |  |  |  |  |  |  |  |  |  |
Total investment related gains (losses), net |  |  |  |  |  |  |  |  | 254,136,000 | (36,056,000) | 212,030,000 |
Provision for income taxes |  |  |  |  |  |  |  |  | 287,330,000 | 217,526,000 | 270,439,000 |
Net income | 222,989,000 | 144,475,000 | 141,111,000 | 123,318,000 | 138,579,000 | 134,602,000 | 123,944,000 | 148,920,000 | 631,893,000 | 546,045,000 | 535,742,000 |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |
Other, net |  |  |  |  |  |  |  |  | 85,523,000 | 134,835,000 | 30,359,000 |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 1,974,527,000 | 1,309,532,000 | 1,842,740,000 |
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |  |
Sales of fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  | 5,465,014,000 | 3,165,479,000 | 3,319,453,000 |
Purchases of fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  | 6,818,378,000 | 4,011,985,000 | 4,854,416,000 |
Change in short-term investments and other invested assets |  |  |  |  |  |  |  |  | 317,488,000 | 91,880,000 | 37,395,000 |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (1,967,996,000) | (905,781,000) | (1,720,482,000) |
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | 61,945,000 | 44,229,000 | 35,170,000 |
Purchases of treasury stock |  |  |  |  |  |  |  |  | 6,924,000 | 380,345,000 | 718,000 |
Excess tax benefits from share-based payment arrangement cash flow |  |  |  |  |  |  |  |  | 416,000 | 4,933,000 | (2,255,000) |
Exercise of stock options, net |  |  |  |  |  |  |  |  | (3,087,000) | 6,449,000 | 2,277,000 |
Change in cash collateral for derivative positions |  |  |  |  |  |  |  |  | (132,933,000) | 231,180,000 | 26,324,000 |
Principal payments on debt |  |  |  |  |  |  |  |  | 0 | 0 | 0 |
Maturity of trust preferred securities |  |  |  |  |  |  |  |  | 0 | 159,473,000 | 0 |
Proceeds from affiliated long-term debt issuance |  |  |  |  |  |  |  |  | 400,000,000 | 397,788,000 | 0 |
PaymentsOfDebtIssuanceCosts |  |  |  |  |  |  |  |  | 6,255,000 | 3,400,000 | 0 |
Proceeds from redemption and remarketing of trust preferred securities |  |  |  |  |  |  |  |  | 0 | 154,588,000 | 0 |
Net cash used in financing activities |  |  |  |  |  |  |  |  | 281,939,000 | 101,995,000 | (193,429,000) |
Change in cash and cash equivalents |  |  |  |  |  |  |  |  | 297,022,000 | 499,209,000 | (48,366,000) |
Cash and cash equivalents, beginning of period |  |  |  | 962,870,000 |  |  |  | 463,661,000 | 962,870,000 | 463,661,000 | 512,027,000 |
Cash and cash equivalents, end of period | 1,259,892,000 |  |  |  | 962,870,000 |  |  |  | 1,259,892,000 | 962,870,000 | 463,661,000 |
Supplementary information: |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for interest |  |  |  |  |  |  |  |  | 100,984,000 | 100,733,000 | 95,939,000 |
Cash paid for income taxes, net of refunds |  |  |  |  |  |  |  |  | 97,000,000 | 129,009,000 | 10,452,000 |
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |
Fixed maturity securities available-for-sale | 604,896,000 |  |  |  | 467,306,000 |  |  |  | 604,896,000 | 467,306,000 |  |
Short-term investments | 64,681,000 |  |  |  | 44,825,000 |  |  |  | 64,681,000 | 44,825,000 |  |
Cash and cash equivalents | 52,680,000 |  |  |  | 71,506,000 |  |  |  | 52,680,000 | 71,506,000 | 31,698,000 |
Investments In Subsidiary | 8,148,532,000 |  |  |  | 6,879,608,000 |  |  |  | 8,148,532,000 | 6,879,608,000 |  |
Loans and Leases Receivable, Related Parties | 1,025,000,000 |  |  |  | 775,000,000 |  |  |  | 1,025,000,000 | 775,000,000 |  |
Other assets | 155,190,000 |  |  |  | 132,841,000 |  |  |  | 155,190,000 | 132,841,000 |  |
Total assets | 10,050,979,000 |  |  |  | 8,371,086,000 |  |  |  | 10,050,979,000 | 8,371,086,000 |  |
Liabilities and Stockholders Equity |  |  |  |  |  |  |  |  |  |  |  |
Short-term and long-term debt - unaffiliated | 1,895,181,000 |  |  |  | 1,494,615,000 |  |  |  | 1,895,181,000 | 1,494,615,000 |  |
Long-term debt - affiliated | 500,000,000 |  |  |  | 500,000,000 |  |  |  | 500,000,000 | 500,000,000 |  |
Other liabilities | 745,611,000 |  |  |  | 557,773,000 |  |  |  | 745,611,000 | 557,773,000 |  |
Total stockholders equity | 6,910,187,000 |  |  |  | 5,818,698,000 |  |  |  | 6,910,187,000 | 5,818,698,000 |  |
Total liabilities and stockholders equity | 10,050,979,000 |  |  |  | 8,371,086,000 |  |  |  | 10,050,979,000 | 8,371,086,000 |  |
CONSOLIDATED STATEMENTS OF INCOME |  |  |  |  |  |  |  |  |  |  |  |
Interest and Dividend Income, Operating |  |  |  |  |  |  |  |  | 86,396,000 | 245,631,000 | 128,448,000 |
Total investment related gains (losses), net |  |  |  |  |  |  |  |  | 4,515,000 | 1,723,000 | 2,944,000 |
Operating Expenses |  |  |  |  |  |  |  |  | (26,431,000) | (32,550,000) | (19,442,000) |
Interest and Debt Expense |  |  |  |  |  |  |  |  | (143,260,000) | (111,600,000) | (96,556,000) |
Income (loss) before income tax and undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (78,780,000) | 103,204,000 | 15,394,000 |
Provision for income taxes |  |  |  |  |  |  |  |  | (9,566,000) | 8,935,000 | 6,707,000 |
Net income (loss) before undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | (69,214,000) | 94,269,000 | 8,687,000 |
Equity In Undistributed Eanings Of Subsidiaries |  |  |  |  |  |  |  |  | 701,107,000 | 451,776,000 | 527,055,000 |
Net income |  |  |  |  |  |  |  |  | 631,893,000 | 546,045,000 | 535,742,000 |
Cash Flows from Operating Activities: |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  | 631,893,000 | 546,045,000 | 535,742,000 |
Equity Net Earnings Subsidiaries |  |  |  |  |  |  |  |  | (701,107,000) | (453,806,000) | (528,228,000) |
Loss On Retirement Of Trust Preferred Securities |  |  |  |  |  |  |  |  | 0 | 4,391,000 | 0 |
Other, net |  |  |  |  |  |  |  |  | 134,232,000 | 143,716,000 | 12,205,000 |
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 65,018,000 | 240,346,000 | 19,719,000 |
Cash Flows from Investing Activities: |  |  |  |  |  |  |  |  |  |  |  |
Sales of fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  | 122,212,000 | 171,791,000 | 169,910,000 |
Purchases of fixed maturity securities available-for-sale |  |  |  |  |  |  |  |  | (213,548,000) | (116,010,000) | (214,025,000) |
Purchases Of Subsidiary Debt Securities |  |  |  |  |  |  |  |  | (250,000,000) | (475,000,000) | (100,000,000) |
Maturity Of Subsidiary Debt Securities |  |  |  |  |  |  |  |  | 0 | 50,000,000 | 226,550,000 |
Change in short-term investments and other invested assets |  |  |  |  |  |  |  |  | 5,718,000 | (2,055,000) | 7,688,000 |
Captial Contributions To Subsidiaries |  |  |  |  |  |  |  |  | (70,431,000) | (105,575,000) | (73,950,000) |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (406,049,000) | (476,849,000) | 16,173,000 |
Cash Flows from Financing Activities: |  |  |  |  |  |  |  |  |  |  |  |
Dividends to stockholders |  |  |  |  |  |  |  |  | (61,945,000) | (44,229,000) | (35,170,000) |
Purchases of treasury stock |  |  |  |  |  |  |  |  | (6,924,000) | (380,345,000) | (718,000) |
Excess tax benefits from share-based payment arrangement cash flow |  |  |  |  |  |  |  |  | 416,000 | 4,933,000 | (2,255,000) |
Exercise of stock options, net |  |  |  |  |  |  |  |  | (3,087,000) | 6,449,000 | 2,277,000 |
Change in cash collateral for derivative positions |  |  |  |  |  |  |  |  | 0 | 0 | 6,759,000 |
Principal payments on debt |  |  |  |  |  |  |  |  | 0 | (200,000,000) | 0 |
Maturity of trust preferred securities |  |  |  |  |  |  |  |  | 0 | (159,473,000) | 0 |
Proceeds from affiliated long-term debt issuance |  |  |  |  |  |  |  |  | 0 | 500,000,000 | 0 |
Proceeds from unaffiliated long-term debt issuance |  |  |  |  |  |  |  |  | 400,000,000 | 397,788,000 | 0 |
PaymentsOfDebtIssuanceCosts |  |  |  |  |  |  |  |  | (6,255,000) | (3,400,000) | 0 |
Proceeds from redemption and remarketing of trust preferred securities |  |  |  |  |  |  |  |  | 0 | 154,588,000 | 0 |
Net cash used in financing activities |  |  |  |  |  |  |  |  | 322,205,000 | 276,311,000 | (29,107,000) |
Change in cash and cash equivalents |  |  |  |  |  |  |  |  | (18,826,000) | 39,808,000 | 6,785,000 |
Cash and cash equivalents, beginning of period |  |  |  | 71,506,000 |  |  |  | 31,698,000 | 71,506,000 | 31,698,000 | 24,913,000 |
Cash and cash equivalents, end of period | 52,680,000 |  |  |  | 71,506,000 |  |  |  | 52,680,000 | 71,506,000 | 31,698,000 |
Supplementary information: |  |  |  |  |  |  |  |  |  |  |  |
Cash paid for interest |  |  |  |  |  |  |  |  | 130,047,000 | 98,809,000 | 96,760,000 |
Cash paid for income taxes, net of refunds |  |  |  |  |  |  |  |  | $ 30,500,000 | $ 0 | $ (37,200,000) |

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- Definition Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -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 FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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