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Fair Value of Financial Instruments (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Fair value of financial instruments: |  |  |
Derivative, Net Hedge Ineffectiveness Gain (Loss) | $ 0 | $ 0 | $ 0
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net | 517,000 | (289,000) | 0
Cost of Sales [Member] |  |  |
Fair value of financial instruments: |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | 445,000 | 12,000 | 0
Selling, General and Administrative Expenses [Member] |  |  |
Fair value of financial instruments: |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 67,000 | $ 2,000 | $ 0
Assets [Member] |  |  |
Fair value of financial instruments: |  |  |
Description of Location of Foreign Currency Derivatives on Balance Sheet | Prepaid expense other current assets | Prepaid expense other current assets |
Foreign Currency Contract, Asset, Fair Value Disclosure | $ 0 | $ 0 |
Derivative, Notional Amount | $ 0 | $ 0 |
Liability [Member] |  |  |
Fair value of financial instruments: |  |  |
Description of Location of Foreign Currency Derivatives on Balance Sheet | Accrued liabilities other | Accrued liabilities other |
Foreign Currency Contracts, Liability, Fair Value Disclosure | $ 298,000 | $ 303,000 |
Derivative, Notional Amount | $ 8,766,000 | $ 6,502,000 |
Minimum [Member] |  |  |
Fair value of financial instruments: |  |  |
Derivative, Forward Exchange Rate | 19.17 | 20.01 |
Maximum [Member] |  |  |
Fair value of financial instruments: |  |  |
Derivative, Forward Exchange Rate | 20.41 | 20.68 |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Contractual rate at which a foreign currency can be purchased or sold. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 + Details
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- Definition Amount of gain (loss) from the ineffectiveness of the hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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