Other (Income) Expense Foreign Currency Gain Loss by Currency (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other (Income) Expense [Line Items]
Gain (loss) by currency	$ 570	$ 1,135	$ 389	$ 2,221
British Pound [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	163	89	341	65
Canadian Dollar [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	197	(113)	285	244
Euro [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	18	108	20	92
Other Currencies Net [Member]
Other (Income) Expense [Line Items]
Gain (loss) by currency	$ 192	$ 1,051	$ (257)	$ 1,820