Other Items Impacting Comparability Schedule of Other Items Impacting Comparability (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Operating tax adjustment	$ 0	$ 2,200	$ 0	$ 2,205	$ 0
Restructuring	(2,574)		0	(2,574)	0
Pension-related adjustments	0		7,650	0	7,650
Restructuring and other items, net	$ (2,574)		$ 7,650	$ (369)	$ 7,650