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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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959

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- Definition

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.

+ References

No definition available.

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Derivatives Notional Amounts - Not Designated as Hedges (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Derivative [Line Items]
Notional Amount		$ 29,504		$ 25,318
Gain (Loss)		(214)		219
Forward exchange contracts—net
Derivative [Line Items]
Gain (Loss)	$ 197		$ 427
AUD / USD
Derivative [Line Items]
Notional Amount		6,100		11,500
Gain (Loss)		(14)		167
CAD / USD
Derivative [Line Items]
Notional Amount		12,785		0
Gain (Loss)		(126)		0
EUR / USD
Derivative [Line Items]
Notional Amount		669		0
Gain (Loss)		22		0
NZD / USD
Derivative [Line Items]
Notional Amount		3,950		3,000
Gain (Loss)		(126)		30
AUD / NZD
Derivative [Line Items]
Notional Amount		6,000		10,800
Gain (Loss)		30		22
EUR / NOK
Derivative [Line Items]
Notional Amount		0		18
Gain (Loss)		$ 0		$ 0