Other (Income) Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement Location [Line Items]
Other Nonoperating Income (Expense)	$ (24)	$ (47)	$ 849	$ (51)
Total other (income) expense, net	(24)	(47)	849	(51)
Other Income [Member]
Income Statement Location [Line Items]
Other Nonoperating Income (Expense)	(54)	(124)	(43)	(252)
Rents and Royalties Income (Loss) [Member]
Income Statement Location [Line Items]
Other Nonoperating Income (Expense)	(109)	(98)	(231)	(199)
Severance and other charges [Member]
Income Statement Location [Line Items]
Other Nonoperating Income (Expense)	0	0	1,145	0
Investment Income [Member]
Income Statement Location [Line Items]
Other Nonoperating Income (Expense)	(96)	(136)	(175)	(324)
gain loss on sale of asset [Member]
Income Statement Location [Line Items]
Other Nonoperating Income (Expense)	(123)	(122)	(302)	(488)
Foreign Currency Gain (Loss) [Member]
Income Statement Location [Line Items]
Other Nonoperating Income (Expense)	$ 358	$ 433	$ 455	$ 1,212