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Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Fair Values of Derivative Assets and Liabilities | The fair values of derivative assets and liabilities, net, all of which are classified as Level 2, reported within ‘Accrued expenses and other liabilities’ in the consolidated balance sheets were:
| December 31, 2018 |  | December 31, 2017
| Derivative Assets |  | Derivative Liabilities |  | Derivative Assets |  | Derivative Liabilities
| (in thousands)
Forward foreign currency exchange contracts | $ | 943 |  |  | $ | (2,256 | ) |  | $ | 1,241 |  |  | $ | (1,647 | )
Netting of counterparty contracts | (943 | ) |  | 943 |  |  | (1,241 | ) |  | 1,241 |
Foreign currency forward contract derivatives | $ | — |  |  | $ | (1,313 | ) |  | $ | — |  |  | $ | (406 | )
Summary of Derivative Financial Instruments Notional Amounts on Outstanding Positions | The notional amounts of outstanding forward foreign currency exchange contracts shown below report the total U.S. Dollar equivalent position and the net contract fair values for each foreign currency position.
| December 31, 2018 |  | December 31, 2017
| Notional |  | Fair Value |  | Notional |  | Fair Value
| (in thousands)
Euro | $ | 34,959 |  |  | $ | (92 | ) |  | $ | 37,718 |  |  | $ | (122 | )
Singapore Dollar | 34,584 |  |  | 254 |  |  | 73,455 |  |  | 364 |
Japanese Yen | 25,561 |  |  | (178 | ) |  | 30,688 |  |  | (89 | )
British Pound Sterling | 22,185 |  |  | 183 |  |  | 13,233 |  |  | 80 |
South Korean Won | 9,408 |  |  | 63 |  |  | 15,888 |  |  | (134 | )
Other currencies | 67,885 |  |  | (1,543 | ) |  | 53,698 |  |  | (505 | )
Total | $ | 194,582 |  |  | $ | (1,313 | ) |  | $ | 224,680 |  |  | $ | (406 | )
Latest maturity date | January 2019 |  |  | January 2018 |
Schedule of Gains / Losses from Foreign Currency Transactions and Derivative Contracts | Amounts reported in ‘Foreign currency gains (losses), net’ in the consolidated statements of operations include both realized and unrealized gains (losses) from foreign currency transactions and derivative contracts and were as follows:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (in thousands)
Foreign currency transaction gains | $ | 552 |  |  | $ | 2,284 |  |  | $ | 10,814 |
Foreign currency forward exchange contracts gains (losses) | 766 |  |  | (1,721 | ) |  | (13,268 | )
Foreign currency gains (losses), net | $ | 1,318 |  |  | $ | 563 |  |  | $ | (2,454 | )

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4E -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624181-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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