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

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Fair Value Measurement (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets:
Short-term investments	$ 123,805	$ 94,202
Foreign currency forward exchange contracts not accounted for using hedge accounting	123
Foreign currency forward exchange contracts accounted for using hedge accounting	2,452
Total Assets	126,380
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	668	908
Total Liabilities		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
Foreign currency forward exchange contracts 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	123,805	94,202
Foreign currency forward exchange contracts not accounted for using hedge accounting	123
Foreign currency forward exchange contracts accounted for using hedge accounting	2,452
Total Assets	126,380
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	668	908
Total Liabilities		1,507
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Short-term investments
Foreign currency forward exchange contracts not accounted for using hedge accounting
Foreign currency forward exchange contracts 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