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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Contractual rate at which a foreign currency can be purchased or sold.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Date the derivative contract matures, in CCYY-MM-DD format.

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Fair value as of the balance sheet date of all foreign currency derivative liabilities not designated as hedging instruments.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

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Market Risks and Derivative Hedge Contracts (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Derivatives, Fair Value [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value	$ (61)		$ (61)		$ (127)
Derivative [Line Items]
Net gains associated with foreign currency derivatives	700	$ 400	800	$ 1,100
Forward Purchase Contract, Euro [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 464		$ 464
Traded exchange rate	1.16		1.16
Value date	Jul. 19, 2018
Forward Purchase Contract, Euro [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 27,437		$ 27,437
Traded exchange rate	10.16		10.16
Value date	Jul. 19, 2018
Forward Purchase Contract, Pounds Sterling [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 2,521		$ 2,521
Traded exchange rate	1.33		1.33
Value date	Jul. 19, 2018
Forward Purchase Contract, Brazil Real [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 5,941		$ 5,941
Traded exchange rate	1.31		1.31
Value date	Jul. 19, 2018
Forward Purchase Contract, Mexican Pesos [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 1,692		$ 1,692
Traded exchange rate	20.68		20.68
Value date	Jul. 19, 2018
Forward Sale Contract, Norwegian Krone [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 985		$ 985
Traded exchange rate	8.12		8.12
Value date	Jul. 19, 2018
Forward Sale Contract, Mexican Pesos (2) [Member]
Derivative [Line Items]
U.S. Dollar notional amount	$ 6,083		$ 6,083
Traded exchange rate	20.71		20.71
Value date	Jul. 19, 2018
Current Assets [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	$ 22		$ 22			$ 130
Forward sale contracts	158		158		111
Current Liabilities [Member]
Derivatives, Fair Value [Line Items]
Forward purchase contracts	0		0		(113)
Forward sale contracts	$ (241)		$ (241)		$ (255)