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Investments (Details 1) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost/Cost | $ 5,509,859 | $ 5,311,457
Unrealized Gains | 645,709 | 660,665
Unrealized Losses | 11,895 | 9,890
Fair value of issued securities | 6,143,673 | 5,962,232
OTTI in AOCI | 2,880 | 3,214
Equity securities, Amortized Cost/Cost | 53,117 | 52,396
Equity securities, Fair Value | 58,661 | 53,503
Mortgage-backed securities [Member] |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost/Cost | 562,657 | 547,040
Unrealized Gains | 69,206 | 72,644
Unrealized Losses | 439 | 125
Fair value of issued securities | 631,424 | 619,559
Other, including U.S. Treasury Securities [Member] |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost/Cost | 415,050 | 371,706
Unrealized Gains | 34,127 | 37,857
Unrealized Losses | 658 | 135
Fair value of issued securities | 448,519 | 409,428
Municipal bonds [Member] |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost/Cost | 1,422,405 | 1,402,424
Unrealized Gains | 185,899 | 186,261
Unrealized Losses | 4,062 | 2,648
Fair value of issued securities | 1,604,242 | 1,586,037
Foreign government bonds [Member] |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost/Cost | 50,445 | 48,476
Unrealized Gains | 8,915 | 9,393
Unrealized Losses | 17 |
Fair value of issued securities | 59,343 | 57,869
Corporate bonds [Member] |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost/Cost | 2,347,748 | 2,258,554
Unrealized Gains | 305,976 | 313,430
Unrealized Losses | 4,204 | 4,950
Fair value of issued securities | 2,649,520 | 2,567,034
Other mortgage-backed securities [Member] |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Amortized Cost/Cost | 711,554 | 683,257
Unrealized Gains | 41,586 | 41,080
Unrealized Losses | 2,515 | 2,032
Fair value of issued securities | 750,625 | 722,305
OTTI in AOCI | 2,880 | 3,214
Equity securities [Member] |  |
Unrealized gains and losses on fixed maturities and equity securities |  |
Unrealized Gains | 6,251 | 2,397
Unrealized Losses | 707 | 1,290
Equity securities, Amortized Cost/Cost | 53,117 | 52,396
Equity securities, Fair Value | $ 58,661 | $ 53,503

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of equity securities categorized neither as held-to-maturity nor as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 3 -Subparagraph c -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 12 -Subparagraph b -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 Emerging Issues Task Force (EITF) -Number 86-40 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -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 9: 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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19 -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. + Details
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