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Fair Value of Financial Instruments (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets:
Short-term investments	$ 69,899	$ 94,202
Foreign currency forward exchange contracts accounted for using hedge accounting	26
Foreign currency forward exchange contracts not accounted for using hedge accounting	119
Total Assets	70,044
Liabilities:
Foreign currency forward exchange contracts accounted for using hedge accounting		181
Foreign currency forward exchange contracts not accounted for using hedge accounting		418
Interest rate swap	529	908
Total Liabilities	529	1,507
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Short-term investments
Foreign currency forward exchange contracts not accounted for using hedge accounting
Total Assets
Liabilities:
Foreign currency forward exchange contracts accounted for using hedge accounting
Foreign currency forward exchange contracts not accounted for using hedge accounting
Interest rate swap
Total Liabilities
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Short-term investments	69,899	94,202
Foreign currency forward exchange contracts accounted for using hedge accounting	26
Foreign currency forward exchange contracts not accounted for using hedge accounting	119
Total Assets	70,044
Liabilities:
Foreign currency forward exchange contracts accounted for using hedge accounting		181
Foreign currency forward exchange contracts not accounted for using hedge accounting		418
Interest rate swap	529	908
Total Liabilities	529	1,507
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Short-term investments
Foreign currency forward exchange contracts not accounted for using hedge accounting
Total Assets
Liabilities:
Foreign currency forward exchange contracts accounted for using hedge accounting
Foreign currency forward exchange contracts not accounted for using hedge accounting
Interest rate swap
Total Liabilities

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

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