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Derivatives and Hedging Instruments - Effects of Derivatives Designated as Hedging Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Derivative [Line Items] |  |  |  |
Gain or (Loss) Recognized in OCI | $ (786) | $ 998 | $ (1,615) | $ 922
Foreign currency exchange contracts | Cash Flow Hedging | Salaries and employee benefits |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) Recognized in OCI | (967) | 1,146 | (1,074) | 1,735
Gain or (Loss) Reclassified from OCI into Income - Effective Portion | 434 | 297 | 983 | 472
Foreign currency exchange contracts | Cash Flow Hedging | General and administrative expenses |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) Recognized in OCI | (76) | 160 | (76) | 240
Gain or (Loss) Reclassified from OCI into Income - Effective Portion | 35 | 27 | 35 | 41
Interest rate swap agreements | Cash Flow Hedging | Interest expense |  |  |  |
Derivative [Line Items] |  |  |  |
Gain or (Loss) Recognized in OCI | (21) | 14 | (12) | 19
Gain or (Loss) Reclassified from OCI into Income - Effective Portion | $ 8 | $ 33 | $ 25 | $ 110

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- Definition Amount, after tax and before reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e637-108580 + Details
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