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Derivatives and Risk Management Derivative Notional Amounts (Details) - Derivatives Designated as Hedging Instruments - Cash Flow Hedging - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Derivative [Line Items] |  |
Notional amount | $ 60,186 | $ 106,750
Foreign Exchange Contract | United Kingdom, Pounds |  |
Derivative [Line Items] |  |
Notional amount | 7,610 | 10,128
Foreign Exchange Contract | Japan, Yen |  |
Derivative [Line Items] |  |
Notional amount | 16,023 | 25,342
Foreign Exchange Contract | Euro Member Countries, Euro |  |
Derivative [Line Items] |  |
Notional amount | 36,553 | 48,838
Interest Rate Swap Contracts |  |
Derivative [Line Items] |  |
Notional amount | $ 0 | $ 22,442

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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959 + Details
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