Other Items Impacting Comparability (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Items Impacting Comparability [Abstract]
Pension-related adjustments	$ (7,650)	$ 509	$ (12,564)
Restructuring and other charges, net	(5,074)	(14,225)	(2,387)
Pension lump sum settlement loss	0	0	(97,231)
Acquisition-related tax adjustment	0	0	(1,808)
Acquisition transaction costs	0		(566)
Consulting fees	0	(3,843)	(400)
Restructuring and other charges, net and other items	$ (12,724)	$ (17,559)	$ (114,956)