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Derivative Instruments - Outstanding Forward Contracts (Details) ₩ in Thousands, ¥ in Thousands, £ in Thousands, TWD in Thousands, SGD in Thousands, HUF in Thousands, $ in Thousands	Dec. 31, 2017 USD ($)	Dec. 31, 2017 HUF	Dec. 31, 2017 GBP (£)	Dec. 31, 2017 SGD	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 TWD	Dec. 31, 2016 USD ($)	Dec. 31, 2016 HUF	Dec. 31, 2016 GBP (£)	Dec. 31, 2016 SGD	Dec. 31, 2016 JPY (¥)	Dec. 31, 2016 KRW (₩)	Dec. 31, 2016 TWD
Designated as Hedging Instrument [Member] | Japan, Yen
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 0				¥ 0			$ 2,960				¥ 342,500
Designated as Hedging Instrument [Member] | Hungary, Forint
Derivative [Line Items]
Derivative Asset, Notional Amount	0	HUF 0						130	HUF 39,000
Designated as Hedging Instrument [Member] | Singapore, Dollars
Derivative [Line Items]
Derivative Asset, Notional Amount	0			SGD 0				97			SGD 150
Not Designated as Hedging Instrument [Member] | Japan, Yen
Derivative [Line Items]
Derivative Asset, Notional Amount	4,049				¥ 455,000			5,554				¥ 650,000
Not Designated as Hedging Instrument [Member] | Korea (South), Won
Derivative [Line Items]
Derivative Asset, Notional Amount	1,708					₩ 1,825,000		1,450					₩ 1,750,000
Not Designated as Hedging Instrument [Member] | Hungary, Forint
Derivative [Line Items]
Derivative Asset, Notional Amount	2,110	HUF 545,000						1,448	HUF 425,000
Not Designated as Hedging Instrument [Member] | Singapore, Dollars
Derivative [Line Items]
Derivative Asset, Notional Amount	0			SGD 0				929			SGD 1,350
Not Designated as Hedging Instrument [Member] | United Kingdom, Pounds
Derivative [Line Items]
Derivative Asset, Notional Amount	2,232		£ 1,650					1,658		£ 1,350
Not Designated as Hedging Instrument [Member] | Taiwan, New Dollars
Derivative [Line Items]
Derivative Asset, Notional Amount	1,278						TWD 37,725	802						TWD 26,000
Not Designated as Hedging Instrument [Member] | Swiss Franc
Derivative [Line Items]
Derivative Asset, Notional Amount	$ 1,401						TWD 1,365	$ 0						TWD 0

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- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Notional Amount
-URI http://asc.fasb.org/extlink&oid=6519104

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959

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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.

+ Details

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