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Basis of Presentation (Details 1) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net Unrealized Investment Gains and Losses on Fixed Maturity and Equity Securities    
Beginning balance [1],[2] $ 175,738 $ 175,167
Other comprehensive income (loss) before reclassifications [1],[2] 22,330 69,971
Amounts reclassified from accumulated other comprehensive income (loss) [1],[2] 203 (481)
Net current period other comprehensive income (loss) [1],[2] 22,533 69,490
Ending balance [1],[2] 198,271 244,657
Defined Benefit Plans    
Beginning balance [1] (11,817) (11,794)
Other comprehensive income (loss) before reclassifications [1] 0 0
Amounts reclassified from accumulated other comprehensive income (loss) [1] 0 0
Net current period other comprehensive income [1] 0 0
Ending balance [1] (11,817) (11,794)
Beginning balance [1] 163,921 163,373
Other comprehensive income (loss) before reclassifications [1] 22,330 69,971
Amounts reclassified from accumulated other comprehensive income (loss) [1] 203 (481)
Other comprehensive income [1] 22,533 69,490
Ending balance [1] $ 186,454 $ 232,863
[1] All amounts are net of tax.
[2] The pretax amounts reclassified from accumulated other comprehensive income (loss), $(313) and $740, are included in net realized investment gains and losses and the related income tax expenses, $(110) and $259, are included in income tax expense in the Consolidated Statements of Operations for the three months ended March 31, 2017 and 2016, respectively.