Employee Benefit Plans (Amounts Recognized in Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Pension Benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss (gain)	$ 17,062	$ 16,586
Amount recognized in accumulated other comprehensive loss	$ 17,062	16,586
Postretirement Benefit Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net actuarial loss (gain)		(2,801)
Prior service cost		158
Amount recognized in accumulated other comprehensive loss		$ (2,643)