Schedule of Other Items Impacting Comparability (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Other Income and Expenses [Abstract]
Pension settlement charges	$ 5,454,000		$ 0	$ 5,454,000	$ 0
Fees related to cost-savings program	4,255,000		0	4,255,000	0
Operating tax adjustment	0	$ 2,200,000	0	2,205,000	0
Restructuring	0		0	(2,574,000)	0
Pension-related adjustments	0		0	0	7,650,000
Restructuring and other items, net	$ 9,709,000		$ 0	$ 9,340,000	$ 7,650,000