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Summary of Significant Accounting Policies (Details 8) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ 19,823 | $ 26,923 | $ 11,866 | $ 25,153 | $ 21,040 | $ 21,984 | $ 16,183 | $ 34,275 | $ 30,068 | $ 25,357 | $ 20,452 | $ 28,366 | $ 83,765 | $ 93,482 | $ 104,243
Change in net unrealized investment gains and losses on fixed maturities and equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized investment gains and losses on fixed maturities and equity securities arising during the period |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,144 | (178,035) | 264,136
Less: reclassification adjustment for net gains included in income before income tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,176 | 11,667 | 10,943
Total, before tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 968 | (189,702) | 253,193
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  | 397 | (67,315) | 89,629
Total, net of tax | [1],[2] |  |  |  |  |  |  |  |  |  |  |  |  | 571 | (122,387) | 163,564
Change in net funded status of pension and other postretirement benefit obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Before tax |  |  |  |  |  |  |  |  |  |  |  |  |  | (37) | 1,815 | (1,810)
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  | (14) | 656 | (633)
Total, net of tax | [1] |  |  |  |  |  |  |  |  |  |  |  |  | (23) | 1,159 | (1,177)
Total comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 84,313 | $ (27,746) | $ 266,630
[1] | All amounts are net of tax.
[2] | The pretax amounts reclassified from accumulated other comprehensive income, $5,176, $11,667 and $10,943, are included in net realized investment gains and losses and the related tax expenses, $1,812, $4,083 and $3,830, are included in income tax expense in the Consolidated Statements of Operations for the years ended December 31, 2016, 2015 and 2014, respectively.

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