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Fair Value of Financial Instruments and Derivative Instruments Interest Rate Derivatives (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Derivative [Line Items] |  |
Notional amount | $ 0 | $ 71,309
Marindou | Interest Rate Swap |  |
Derivative [Line Items] |  |
Fixed interest rate | 1.60% |
Notional amount | $ 0 | 18,109
Petra | Interest Rate Swap |  |
Derivative [Line Items] |  |
Fixed interest rate | 0.98% |
Notional amount | $ 0 | 14,000
Pemer | Interest Rate Swap |  |
Derivative [Line Items] |  |
Fixed interest rate | 0.9475% |
Notional amount | $ 0 | 14,000
Avstes | Interest Rate Swap |  |
Derivative [Line Items] |  |
Fixed interest rate | 1.35% |
Notional amount | $ 0 | 14,000
Shikoku | Interest Rate Swap |  |
Derivative [Line Items] |  |
Fixed interest rate | 1.25% |
Notional amount | $ 0 | $ 11,200

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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 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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