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Investments (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2014 | Dec. 31, 2013
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | $ 6,187,429 |  | $ 5,784,205 |
Amortized Cost/Cost, Equity securities | 97,224 |  | 84,754 |
Unrealized Gains | 523,683 |  | 344,286 |
Unrealized Losses | 34,773 |  | 118,918 |
Fair Value | 6,676,339 |  | 6,009,573 |
Fair Value, Equity securities | 109,462 |  | 91,858 |
OTTI in AOCI | 2,866 | [1] | 2,812 | [1]
Mortgage-backed securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 546,236 | [2] | 555,574 | [2]
Unrealized Gains | 45,587 | [2] | 33,711 | [2]
Unrealized Losses | 9,691 | [2] | 19,560 | [2]
Fair Value | 582,132 | [2] | 569,725 | [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 | 464,978 | [2] | 449,060 | [2]
Unrealized Gains | 19,207 | [2] | 9,865 | [2]
Unrealized Losses | 8,007 | [2] | 23,351 | [2]
Fair Value | 476,178 | [2] | 435,574 | [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 | 1,455,567 |  | 1,425,441 |
Unrealized Gains | 149,837 |  | 80,701 |
Unrealized Losses | 7,515 |  | 34,615 |
Fair Value | 1,597,889 |  | 1,471,527 |
OTTI in AOCI | 0 | [1] | 0 | [1]
Foreign government bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 50,604 |  | 50,641 |
Unrealized Gains | 6,435 |  | 4,700 |
Unrealized Losses | 0 |  | 390 |
Fair Value | 57,039 |  | 54,951 |
OTTI in AOCI | 0 | [1] | 0 | [1]
Corporate bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | 2,599,455 |  | 2,457,727 |
Unrealized Gains | 269,905 |  | 188,832 |
Unrealized Losses | 5,623 |  | 32,150 |
Fair Value | 2,863,737 |  | 2,614,409 |
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 | 1,070,589 |  | 845,762 |
Unrealized Gains | 32,712 |  | 26,477 |
Unrealized Losses | 3,937 |  | 8,852 |
Fair Value | 1,099,364 |  | 863,387 |
OTTI in AOCI | 2,866 | [1] | 2,812 | [1]
Equity securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost, Equity securities | 97,224 |  | 84,754 |
Unrealized Gains | 13,127 |  | 10,723 |
Unrealized Losses | 889 |  | 3,619 |
Fair Value, Equity securities | 109,462 |  | 91,858 |
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 $342,198 and $336,193; Federal Home Loan Mortgage Corporation (“FHLMC”) of $441,363 and $427,172; and Government National Mortgage Association (“GNMA”) of $136,208 and $126,245 as of June 30, 2014 and December 31, 2013, 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 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 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 + 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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