Market Risks and Derivative Hedge Contracts (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Derivatives, Fair Value [Line Items]
Total	$ (109,000)	$ (174,000)
Derivative [Line Items]
Net gains associated with foreign currency derivatives	540,000
Forward Sale Contract, Euro [Member]
Derivative [Line Items]
U.S. Dollar notional amount	1,176,000
Traded exchange rate	1.07
Value date	Apr. 20, 2015
Forward Purchase Contract, Pounds Sterling [Member]
Derivative [Line Items]
U.S. Dollar notional amount	2,831,000
Traded exchange rate	1.48
Value date	Apr. 20, 2015
Forward Purchase Contract, Brazil Real [Member]
Derivative [Line Items]
U.S. Dollar notional amount	2,044,000
Traded exchange rate	3.21
Value date	Apr. 20, 2015
Forward Purchase Contract, Canadian Dollar [Member]
Derivative [Line Items]
U.S. Dollar notional amount	6,126,000
Traded exchange rate	1.27
Value date	Apr. 20, 2015
Forward Sale Contract, Mexican Pesos [Member]
Derivative [Line Items]
U.S. Dollar notional amount	8,289,000
Traded exchange rate	15.26
Value date	Apr. 20, 2015
Forward Purchase Contract, Norwegian Kroner [Member]
Derivative [Line Items]
U.S. Dollar notional amount	1,411,000
Traded exchange rate	8.06
Value date	Apr. 20, 2015
Forward Purchase Contract, Canadian Dollar (2) [Member]
Derivative [Line Items]
U.S. Dollar notional amount	1,400,000
Traded exchange rate	1.27
Value date	Apr. 20, 2015
Forward Purchase Contract, Mexican Pesos [Member]
Derivative [Line Items]
U.S. Dollar notional amount	915,000
Traded exchange rate	15.26
Value date	Apr. 20, 2015
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	13,000	0
Forward sale contracts	91,000	0
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	(198,000)	(83,000)
Forward sale contracts	$ (15,000)	$ (91,000)