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Fair Value Measurements - Financial Assets and Liabilities Measured and Reported at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Assets:
Foreign currency forward exchange contracts	$ 10,780	$ 7,804	$ 8,706
Available-for-sale security	6,201	8,991	11,201
Total assets	16,981	16,795	19,907
Liabilities:
Foreign currency forward exchange contracts	7,360	19,320	26,618
Level 1
Assets:
Foreign currency forward exchange contracts	0	0	0
Available-for-sale security	6,201	8,991	11,201
Total assets	6,201	8,991	11,201
Liabilities:
Foreign currency forward exchange contracts	0	0	0
Level 2
Assets:
Foreign currency forward exchange contracts	10,780	7,804	8,706
Available-for-sale security	0	0	0
Total assets	10,780	7,804	8,706
Liabilities:
Foreign currency forward exchange contracts	7,360	19,320	26,618
Level 3
Assets:
Foreign currency forward exchange contracts	0	0	0
Available-for-sale security	0	0	0
Total assets	0	0	0
Liabilities:
Foreign currency forward exchange contracts	$ 0	$ 0	$ 0

X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- Definition

Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

+ References

No definition available.

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X

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258

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- References

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