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Derivative Instruments And Hedging Activities - Unrealized Gain (Loss) Recognized In OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized Gain (Loss) Recognized in OCI | $ (95) | $ (680) | $ (847)
Foreign Exchange Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized Gain (Loss) Recognized in OCI | (54) | (315) | (1,453)
Interest Rate Swaps |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Unrealized Gain (Loss) Recognized in OCI | $ (41) | $ (365) | $ 606

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- Definition Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558989&loc=d3e80720-113993 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669646-108580 + Details
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