Market Risks and Derivative Hedge Contracts (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Total	$ (168)		$ (168)			$ (174)
Derivative [Line Items]
Net gains associated with foreign currency derivatives	(200)	$ (800)	(500)	$ (800)
Forward Sale Contract, Euro [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 2,869		$ 2,869
Traded exchange rate	1.13		1.13
Value date			Oct. 16, 2015
Forward Purchase Contract, Pounds Sterling [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 9,035		$ 9,035
Traded exchange rate	1.53		1.53
Value date			Oct. 16, 2015
Forward Sale Contract, Mexican Pesos [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 7,455		$ 7,455
Traded exchange rate	17.06		17.06
Value date			Oct. 16, 2015
Forward Sale Contract, Mexican Pesos (2) [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 3,936		$ 3,936
Traded exchange rate	17.06		17.06
Value date			Oct. 16, 2015
Forward Sale Contract, Saudi Arabia Riyal [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 6,397		$ 6,397
Traded exchange rate	3.75		3.75
Value date			Oct. 16, 2015
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	$ 41		$ 41			0
Forward sale contracts					$ 3	0
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	(135)		(135)			(83)
Forward sale contracts	$ (77)		$ (77)			$ (91)