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Investments (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost |  | $ 7,152,127 |  | $ 6,785,626
Amortized Cost/Cost, Equity securities |  | 134,013 |  | 95,722
Unrealized Gains |  | 374,991 |  | 395,237
Unrealized Losses |  | 70,410 |  | 89,523
Fair Value |  | 7,456,708 |  | 7,091,340
Fair Value, Equity securities |  | 141,649 |  | 99,797
OTTI in AOCI | [1] | 1,618 |  | (2,758)
Mortgage-backed securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | [2] | 412,891 |  | 461,862
Unrealized Gains | [2] | 33,168 |  | 44,413
Unrealized Losses | [2] | 3,640 |  | 1,861
Fair Value | [2] | 442,419 |  | 504,414
OTTI in AOCI | [1] | 0 | [2] | 0
Other, including U.S. Treasury Securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost | [2] | 458,745 |  | 532,373
Unrealized Gains | [2] | 18,518 |  | 21,153
Unrealized Losses | [2] | 10,120 |  | 7,415
Fair Value | [2] | 467,143 |  | 546,111
OTTI in AOCI | [1] | 0 | [2] | 0
Municipal bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost |  | 1,648,252 |  | 1,553,603
Unrealized Gains |  | 143,733 |  | 165,680
Unrealized Losses |  | 22,588 |  | 10,340
Fair Value |  | 1,769,397 |  | 1,708,943
OTTI in AOCI | [1] | 0 |  | (4,140)
Foreign government bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost |  | 93,864 |  | 67,441
Unrealized Gains |  | 5,102 |  | 6,288
Unrealized Losses |  | 297 |  | 112
Fair Value |  | 98,669 |  | 73,617
OTTI in AOCI | [1] | 0 |  | 0
Corporate bonds [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost |  | 2,672,818 |  | 2,687,376
Unrealized Gains |  | 152,229 |  | 140,873
Unrealized Losses |  | 14,826 |  | 48,834
Fair Value |  | 2,810,221 |  | 2,779,415
OTTI in AOCI | [1] | 0 |  | 0
Other mortgage-backed securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost |  | 1,865,557 |  | 1,482,971
Unrealized Gains |  | 22,241 |  | 16,830
Unrealized Losses |  | 18,939 |  | 20,961
Fair Value |  | 1,868,859 |  | 1,478,840
OTTI in AOCI | [1] | 1,618 |  | 1,382
Equity securities [Member] |  |  |  |
Unrealized gains and losses on fixed maturities and equity securities |  |  |  |
Amortized Cost/Cost, Equity securities | [3] | 134,013 |  | 95,722
Unrealized Gains | [3] | 13,210 |  | 8,405
Unrealized Losses | [3] | 5,574 |  | 4,330
Fair Value, Equity securities | [3] | 141,649 |  | 99,797
OTTI in AOCI | [1] | $ 0 | [3] | $ 0
[1] | Related to securities for which an unrealized loss was bifurcated to distinguish the credit-related portion and the portion driven by other market factors. Represents the amount of other-than-temporary impairment losses in AOCI which was not included in earnings; amounts also include net unrealized investment gains and losses on such impaired securities relating to changes in the fair value of those securities subsequent to the impairment measurement date.
[2] | Fair value includes securities issued by Federal National Mortgage Association (“FNMA”) of $196,468 and $231,294; Federal Home Loan Mortgage Corporation (“FHLMC”) of $284,050 and $363,957; and Government National Mortgage Association (“GNMA”) of $115,627 and $130,940 as of December 31, 2016 and 2015, respectively.
[3] | Includes nonredeemable (perpetual) preferred stocks, common stocks and closed-end funds.

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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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 Reference 2: 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 + Details
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