Accumulated Other Comprehensive Income (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated items of other comprehensive income:
Pension settlement charge			$ (8,190)
Pension/postretirement settlements and curtailments, before tax	51	103	8,377
Pension/postretirement settlements and curtailments	$ 45	$ 103	$ 5,167