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Components of Pension Plan Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Amortization of Prior Service Credits	$ (90)	$ (749)	$ (181)	$ (1,498)
Recognized Net Actuarial Loss	354	6,247	708	12,550
Total	264	5,498	527	11,052
Pension Plan [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service Cost	96	149	193	193
Interest Cost	300	476	600	619
Amortization of Prior Service Credits	(90)	(143)	(181)	(186)
Recognized Net Actuarial Loss	373	604	746	786
Curtailment Gain	(416)	0	(416)	0
Total	$ 263	$ 1,086	942	$ 1,412
Decrease in plan liabilities due to plan remeasurement			$ 2,235

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- Definition

Amount of (increase) decrease in accumulated benefit obligation of defined benefit plan from effects of settlement and curtailment.

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Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan.

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