Market Risks and Derivative Hedge Contracts (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Derivatives, Fair Value [Line Items]
Total	$ (17,000)	$ (17,000)	$ (174,000)
Derivative [Line Items]
Net gains associated with foreign currency derivatives	200,000	300,000
Forward Sale Contract, Euro [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 2,403,000	$ 2,403,000
Traded exchange rate	1.12	1.12
Value date		Jul. 17, 2015
Forward Purchase Contract, Pounds Sterling [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 7,491,000	$ 7,491,000
Traded exchange rate	1.57	1.57
Value date		Jul. 17, 2015
Forward Purchase Contract, Brazil Real [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 2,918,000	$ 2,918,000
Traded exchange rate	1.25	1.25
Value date		Jul. 17, 2015
Forward Purchase Contract, Canadian Dollar [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 7,617,000	$ 7,617,000
Traded exchange rate	15.71	15.71
Value date		Jul. 17, 2015
Forward Sale Contract, Mexican Pesos [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 1,640,000	$ 1,640,000
Traded exchange rate	7.84	7.84
Value date		Jul. 17, 2015
Forward Purchase Contract, Norwegian Kroner [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 1,000,000	$ 1,000,000
Traded exchange rate	3.75	3.75
Value date		Jul. 17, 2015
Forward Purchase Contract, Canadian Dollar (2) [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 780,000	$ 780,000
Traded exchange rate	1.25	1.25
Value date		Jul. 17, 2015
Forward Purchase Contract, Mexican Pesos [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 2,066,000	$ 2,066,000
Traded exchange rate	15.71	15.71
Value date		Jul. 17, 2015
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	$ 128,000	$ 128,000	0
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	(30,000)	(30,000)	(83,000)
Forward sale contracts	$ (115,000)	$ (115,000)	$ (91,000)