Market Risks and Derivative Hedge Contracts (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Total	$ (474)	$ (474)	$ (362)
Derivative [Line Items]
Net gains associated with foreign currency derivatives	1,100	1,200
Forward Purchase Contract, Pounds Sterling [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 6,980	$ 6,980
Traded exchange rate	1.42	1.42
Value date	Jul. 18, 2016
Forward Purchase Contract, Mexican Pesos [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 6,990	$ 6,990
Traded exchange rate	19.03	19.03
Value date	Jul. 18, 2016
Forward Sale Contract, Mexican Pesos (2) [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 2,943	$ 2,943
Traded exchange rate	19.03	19.03
Value date	Jul. 18, 2016
Forward Purchase Contract, Euro [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 7,415	$ 7,415
Traded exchange rate	1.13	1.13
Value date	Jul. 18, 2016
Forward Sale Contract, Norwegian Krone [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 1,759	$ 1,759
Traded exchange rate	8.36	8.36
Value date	Jul. 18, 2016
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	$ 0	$ 0	0
Forward sale contracts	271	271	23
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	(634)	(634)	(354)
Forward sale contracts	$ (111)	$ (111)	$ (31)

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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