Other (Income) Expense Foreign Currency Gain Loss by Currency (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Foreign Currency Transaction Gain (Loss), before Tax	$ 1,832	$ 4,507	$ 4,230
AustralianDollar [Member]
Foreign Currency Transaction Gain (Loss), before Tax	136	238	289
British Pound [Member]
Foreign Currency Transaction Gain (Loss), before Tax	807	434	1,132
Canadian Dollar [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(137)	1,848	1,886
Euro [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(49)	(908)	(1,537)
Malaysian Ringgit [Member]
Foreign Currency Transaction Gain (Loss), before Tax	43	545	278
Mexican Peso [Member]
Foreign Currency Transaction Gain (Loss), before Tax	(47)	414	284
Nigerian Naira [Member]
Foreign Currency Transaction Gain (Loss), before Tax	200	630	432
Other Currencies Net [Member]
Foreign Currency Transaction Gain (Loss), before Tax	$ 879	$ 1,306	$ 1,466