Pension (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Pension [Abstract]
Expected pension expense	$ 500			$ 500
Pension Contributions		$ 1,000		1,000
Pension expense	$ 125		$ 115	$ 250	$ 228	$ 459