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Changes in Accumulated Other Comprehensive Loss Reclassification of Adjustments out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Amortization of Prior Service Costs	$ (90)	$ (749)	$ (181)	$ (1,498)
Recognized Net Actuarial Loss	354	6,247	708	12,550
Total	264	5,498	527	11,052
Less: Tax Benefit	94	2,034	188	4,086
Net of Tax	$ 170	$ 3,464	$ 339	$ 6,966

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