Other (Income) Expense Foreign Currency Gain Loss by Currency (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other (Income) Expense [Line Items]
Gain (loss) by currency	$ (218)	$ 654	$ (181)	$ 1,086
British Pound [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	165	104	178	(23)
Canadian Dollar [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	29	243	88	357
Euro [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	92	(259)	2	(16)
Other Currencies Net [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	$ (504)	$ 566	$ (449)	$ 768