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Fair Value of Financial Instruments (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 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 | $ 284,000 | $ 0
Description of Location of Foreign Currency Derivatives on Balance Sheet | Prepaid expense other current assets | Prepaid expense other current assets
Derivative, Notional Amount | $ 12,207,000 | $ 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 | $ 21,000 | $ 0
Derivative, Notional Amount | 9,318,000 | 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 | $ 424,000 | $ 0
Description of Location of Foreign Currency Derivatives on Balance Sheet | Other non-current assets | Other non-current assets
Derivative, Notional Amount | $ 33,032,000 | $ 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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