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Revolving Credit Facility and Bank Borrowings (Notes Payable) (Details) - Notes Payable [Member] | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Weighted average interest rate (percent) | 2.30% | 2.41%
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable stated interest rate (percent) | 1.95% |
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Notes payable stated interest rate (percent) | 2.826% |

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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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Weighted average interest rate of long-term debt outstanding calculated at point in time. + References No definition available. + Details
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