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Fair Value of Financial Instruments (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.49% |
Foreign Exchange Forward [Member] | Assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | $ 0 | $ 0
Description of Location of Foreign Currency Derivatives on Balance Sheet | Prepaid expense other current assets | Prepaid expense other current assets
Derivative, Notional Amount | $ 0 | $ 0
Foreign Exchange Forward [Member] | Liability [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Description of Location of Foreign Currency Derivatives on Balance Sheet | Accrued liabilities other | Accrued liabilities other
Foreign Currency Contracts, Liability, Fair Value Disclosure | $ 644,000 | $ 0
Derivative, Notional Amount | 20,983,000 | 8,766,000
Interest Rate Swap [Member] | Assets [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | $ 248,000 | $ 0
Description of Location of Foreign Currency Derivatives on Balance Sheet | Other non-current assets | Other non-current assets
Derivative, Notional Amount | $ 33,688,000 | $ 0
Interest Rate Swap [Member] | Liability [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Description of Location of Foreign Currency Derivatives on Balance Sheet | Other non-current liabilities | Other non-current liabilities
Foreign Currency Contracts, Liability, Fair Value Disclosure | $ 0 | $ 0
Derivative, Notional Amount | 0 | $ 0
Interest Rate Swap [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt Instrument, Face Amount | $ 35,000,000 |

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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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Description of where the foreign currency derivatives are reported in the balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c),(d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(7)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5618551-113959 + Details
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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Definition Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into. + References No definition available. + Details
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