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Debt (Schedule of Interest Rate Derivatives) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($)
Interest Rate Swap, Date Entered, May 2012 [Member] |
Derivative [Line Items] |
Derivative, Fixed Interest Rate | 3.29%
Debt Instrument, Description of Variable Rate Basis | 1-month LIBOR
Derivative, Notional Amount | $ 40,000
Interest Rate Swap, Date Entered, June 2013 [Member] |
Derivative [Line Items] |
Derivative, Fixed Interest Rate | 3.86%
Debt Instrument, Description of Variable Rate Basis | 1-month LIBOR
Derivative, Notional Amount | $ 80,000
Interest Rate Cash Flow Hedge Liability at Fair Value | $ (227)
Interest Rate Swap, Date Entered, March 2014 [Member] |
Derivative [Line Items] |
Derivative, Fixed Interest Rate | 3.91%
Debt Instrument, Description of Variable Rate Basis | 1-month LIBOR
Derivative, Notional Amount | $ 130,000
Interest Rate Cash Flow Hedge Liability at Fair Value | $ (520)

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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 The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + 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 Fair value as of the balance sheet date of all interest rate derivative liabilities designated as cash flow 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 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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