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.