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Investments (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost or Cost | $ 5,784,205 |  | $ 5,311,457 |
Unrealized Gains | 344,286 |  | 660,665 |
Unrealized Losses | 118,918 |  | 9,890 |
Fair value of issued securities | 6,009,573 |  | 5,962,232 |
OTTI in AOCI | 2,812 | [1] | 3,214 | [1]
Equity securities, Amortized Cost or Cost | 84,754 |  | 52,396 |
Mortgage-backed securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost or Cost | 555,574 | [2] | 547,040 | [2]
Unrealized Gains | 33,711 | [2] | 72,644 | [2]
Unrealized Losses | 19,560 | [2] | 125 | [2]
Fair value of issued securities | 569,725 | [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 or Cost | 449,060 | [2] | 371,706 | [2]
Unrealized Gains | 9,865 | [2] | 37,857 | [2]
Unrealized Losses | 23,351 | [2] | 135 | [2]
Fair value of issued securities | 435,574 | [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 or Cost | 1,425,441 |  | 1,402,424 |
Unrealized Gains | 80,701 |  | 186,261 |
Unrealized Losses | 34,615 |  | 2,648 |
Fair value of issued securities | 1,471,527 |  | 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 or Cost | 50,641 |  | 48,476 |
Unrealized Gains | 4,700 |  | 9,393 |
Unrealized Losses | 390 |  | 0 |
Fair value of issued securities | 54,951 |  | 57,869 |
OTTI in AOCI | 0 | [1] | 0 | [1]
Corporate Bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost or Cost | 2,457,727 |  | 2,258,554 |
Unrealized Gains | 188,832 |  | 313,430 |
Unrealized Losses | 32,150 |  | 4,950 |
Fair value of issued securities | 2,614,409 |  | 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 or Cost | 845,762 |  | 683,257 |
Unrealized Gains | 26,477 |  | 41,080 |
Unrealized Losses | 8,852 |  | 2,032 |
Fair value of issued securities | 863,387 |  | 722,305 |
OTTI in AOCI | 2,812 | [1] | 3,214 | [1]
Equity Securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Unrealized Gains | 10,723 |  | 2,397 |
Unrealized Losses | 3,619 |  | 1,290 |
Fair value of issued securities | 91,858 |  | 53,503 |
OTTI in AOCI | 0 | [1] | 0 | [1]
Equity securities, Amortized Cost or Cost | $ 84,754 |  | $ 52,396 |
[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 $336,193 and $375,111; Federal Home Loan Mortgage Corporation (“FHLMC”) of $427,172 and $418,174; and Government National Mortgage Association (“GNMA”) of $126,245 and $136,998 as of December 31, 2013 and 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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- Definition Amount of unrealized loss before deducting unrealized gain on investments in 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount after tax of other than temporary impairment (OTTI) loss on investments in available-for-sale and held-to-maturity debt securities, recognized in other comprehensive loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25362-111560 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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