Other (Income) Expense Foreign Currency Gain Loss by Currency (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Other (Income) Expense [Line Items]
Gain (loss) by currency	$ 37	$ 432
British Pound [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	13	(128)
Canadian Dollar [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	59	115
Euro [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	(90)	246
Other Currencies Net [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	$ 55	$ 199