Changes in Accumulated Other Comprehensive Loss Reclassification of Adjustments out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity [Abstract]
Amortization of Prior Service Costs	$ (6)	$ (749)	$ (186)	$ (2,247)
Recognized Net Actuarial Loss	41	6,247	749	18,798
Total	35	5,498	563	16,551
Less: Tax Benefit	13	2,034	202	6,121
Net of Tax	$ 22	$ 3,464	$ 361	$ 10,430