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Derivative Financial Instruments (Classifications on Consolidated Balance Sheets) (Details) - Designated as Hedging Instrument [Member] - USD ($) | 9 Months Ended |
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Sep. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Notional Amount | $ 515,000,000 |
Fair Value | 9,440,000 | $ 5,345,000
Interest Rate Swap One [Member] |  |
Derivative [Line Items] |  |
Notional Amount | $ 150,000,000 |
Company Fixed Pay Rate | 1.30% |
Fair Value | $ 0 | 326,000
Interest Rate Swap Two [Member] |  |
Derivative [Line Items] |  |
Notional Amount | $ 175,000,000 |
Company Fixed Pay Rate | 1.03% |
Fair Value | $ 6,988,000 | 5,207,000
Interest Rate Swap Three [Member] |  |
Derivative [Line Items] |  |
Notional Amount | $ 40,000,000 |
Company Fixed Pay Rate | 2.47% |
Fair Value | $ 335,000 | 0
Interest Rate Swap Four [Member] |  |
Derivative [Line Items] |  |
Notional Amount | $ 150,000,000 |
Company Fixed Pay Rate | 2.20% |
Fair Value | $ 2,117,000 | $ (188,000)
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap One [Member] |  |
Derivative [Line Items] |  |
Bank Pay Rate | 1 month |
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Two [Member] |  |
Derivative [Line Items] |  |
Bank Pay Rate | 1 month |
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Three [Member] |  |
Derivative [Line Items] |  |
Bank Pay Rate | 1 month |
London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap Four [Member] |  |
Derivative [Line Items] |  |
Bank Pay Rate | 1 month |

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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 Derivative, Interest Rate Term + References No definition available. + Details
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- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109250915&loc=d3e13433-108611 + Details
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- Definition Fixed interest rate related to the interest rate derivative. + 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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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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