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Investments (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | $ 5,591,125 |  | $ 5,311,457 |
Equity securities, Amortized Cost/Cost | 78,016 |  | 52,396 |
Unrealized Gains | 414,120 |  | 660,665 |
Unrealized Losses | 74,631 |  | 9,890 |
Fair value of issued securities | 5,930,614 |  | 5,962,232 |
Equity securities, Fair Value | 83,040 |  | 53,503 |
OTTI in AOCI | 2,653 | [1] | 3,214 | [1]
Mortgage-backed securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 573,425 | [2] | 547,040 | [2]
Unrealized Gains | 46,609 | [2] | 72,644 | [2]
Unrealized Losses | 6,165 | [2] | 125 | [2]
Fair value of issued securities | 613,869 | [2] | 619,559 | [2]
OTTI in AOCI | 0 | [1],[2] | 0 | [1],[2]
Other, including U.S. Treasury Securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 431,906 | [2] | 371,706 | [2]
Unrealized Gains | 17,819 | [2] | 37,857 | [2]
Unrealized Losses | 11,420 | [2] | 135 | [2]
Fair value of issued securities | 438,305 | [2] | 409,428 | [2]
OTTI in AOCI | 0 | [1],[2] | 0 | [1],[2]
Municipal bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 1,413,405 |  | 1,402,424 |
Unrealized Gains | 115,166 |  | 186,261 |
Unrealized Losses | 20,322 |  | 2,648 |
Fair value of issued securities | 1,508,249 |  | 1,586,037 |
OTTI in AOCI | 0 | [1] | 0 | [1]
Foreign government bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 49,517 |  | 48,476 |
Unrealized Gains | 5,913 |  | 9,393 |
Unrealized Losses | 216 |  | 0 |
Fair value of issued securities | 55,214 |  | 57,869 |
OTTI in AOCI | 0 | [1] | 0 | [1]
Corporate bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 2,344,406 |  | 2,258,554 |
Unrealized Gains | 197,675 |  | 313,430 |
Unrealized Losses | 28,376 |  | 4,950 |
Fair value of issued securities | 2,513,705 |  | 2,567,034 |
OTTI in AOCI | 0 | [1] | 0 | [1]
Other mortgage-backed securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 778,466 |  | 683,257 |
Unrealized Gains | 30,938 |  | 41,080 |
Unrealized Losses | 8,132 |  | 2,032 |
Fair value of issued securities | 801,272 |  | 722,305 |
OTTI in AOCI | 2,653 | [1] | 3,214 | [1]
Equity securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Equity securities, Amortized Cost/Cost | 78,016 |  | 52,396 |
Unrealized Gains | 6,373 |  | 2,397 |
Unrealized Losses | 1,349 |  | 1,290 |
Equity securities, Fair Value | 83,040 |  | 53,503 |
OTTI in AOCI | $ 0 | [1] | $ 0 | [1]
[1] | Represents the amount of other-than-temporary impairment losses in AOCI which, beginning April 1, 2009, was not included in earnings under current accounting guidance. Amounts also include unrealized gains/losses on impaired securities relating to changes in the fair value of such securities subsequent to the impairment measurement date.
[2] | Fair value includes securities issued by Federal National Mortgage Association (“FNMA”) of $383,040 and $375,111; Federal Home Loan Mortgage Corporation (“FHLMC”) of $431,649 and $418,174; and Government National Mortgage Association (“GNMA”) of $130,780 and $136,998 as of June 30, 2013 and December 31, 2012, respectively.

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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 This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for 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 debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: 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=28360136&loc=d3e22054-111558 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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