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Derivative and Hedging Activities Derivative and Hedging Activities - Notional Values (Details) - Foreign Exchange Forward [Member] - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Designated as Hedging Instrument [Member] | Long [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Purchase | $ 0 | $ 12,984
Not Designated as Hedging Instrument [Member] | Long [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Purchase | 4,056 | 6,942
Not Designated as Hedging Instrument [Member] | Short [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Sell | $ 11,157 | $ 11,332

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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Notional Amount -URI http://asc.fasb.org/extlink&oid=6519104 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5579245-113959 + Details
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