Other (Income) Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Income Statement Location [Line Items]
Total other (income) expense, net	$ (97)	$ (288)	$ 752	$ (339)
Other Income [Member]
Income Statement Location [Line Items]
Total other (income) expense, net	21	(221)	(22)	(473)
Rents and Royalties Income (Loss) [Member]
Income Statement Location [Line Items]
Total other (income) expense, net	(99)	(105)	(329)	(304)
Severance and other charges [Member]
Income Statement Location [Line Items]
Total other (income) expense, net	0	0	1,145	0
Investment Income [Member]
Income Statement Location [Line Items]
Total other (income) expense, net	(112)	(126)	(287)	(450)
gain loss on sale of asset [Member]
Income Statement Location [Line Items]
Total other (income) expense, net	(12)	(56)	(314)	(544)
Foreign Currency Gain (Loss) [Member]
Income Statement Location [Line Items]
Total other (income) expense, net	$ 105	$ 220	$ 559	$ 1,432