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Derivatives - Impact of Derivatives Contracts on Condensed Consolidated Statements of Operations (Details) - Other income, net - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Unrealized gain (loss) on foreign currency contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on foreign currency contracts | $ 553 | $ (323) | $ 349 | $ 442
Realized gain on foreign currency contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on foreign currency contracts | 1,059 | 447 | 1,471 | 572
Foreign currency contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gain (loss) on foreign currency contracts | $ 1,612 | $ 124 | $ 1,820 | $ 1,014

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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