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Fair Value of Financial Instruments and Derivatives Instuments, detail 4 (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Derivative [Line Items] |  |  |
Notional Amount of Derivatives |  | $ 112,117 | $ 148,565
Pelea | Current Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Inception Date |  | Dec. 15, 2011 |
Derivative, Maturity Date |  | Dec. 14, 2016 |
Derivative, Fixed Interest Rate | [1] | 2.05% |
Notional Amount of Derivatives |  | $ 0 | 28,122
Maxdekatria | Current Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Inception Date |  | Sep. 28, 2012 |
Derivative, Maturity Date |  | Sep. 28, 2017 |
Derivative, Fixed Interest Rate | [1] | 0.90% |
Notional Amount of Derivatives |  | $ 16,800 | 18,400
Marindou | Current Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Inception Date |  | Jan. 14, 2013 |
Derivative, Maturity Date |  | Jan. 16, 2018 |
Derivative, Fixed Interest Rate | [1] | 1.60% |
Notional Amount of Derivatives |  | $ 21,215 | 24,321
Petra | Current Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Inception Date |  | Jan. 18, 2013 |
Derivative, Maturity Date |  | Jan. 18, 2018 |
Derivative, Fixed Interest Rate | [1] | 0.98% |
Notional Amount of Derivatives |  | $ 14,000 | 14,000
Marinouki | Current Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Inception Date |  | Mar. 05, 2013 |
Derivative, Maturity Date |  | Mar. 05, 2018 |
Derivative, Fixed Interest Rate | [1] | 1.48% |
Notional Amount of Derivatives |  | $ 19,035 | 20,789
Pemer | Current Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Inception Date |  | Jun. 07, 2013 |
Derivative, Maturity Date |  | Mar. 07, 2018 |
Derivative, Fixed Interest Rate | [1] | 0.9475% |
Notional Amount of Derivatives |  | $ 14,000 | 14,000
Avstes | Current Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Inception Date |  | Jul. 18, 2013 |
Derivative, Maturity Date |  | Apr. 18, 2018 |
Derivative, Fixed Interest Rate | [1] | 1.35% |
Notional Amount of Derivatives |  | $ 14,000 | 14,000
Shikoku | Current Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Derivative, Inception Date |  | Aug. 28, 2013 |
Derivative, Maturity Date |  | Aug. 28, 2018 |
Derivative, Fixed Interest Rate | [1] | 1.25% |
Notional Amount of Derivatives |  | $ 13,067 | $ 14,933
[1] | Under all above swap transactions, the bank effects quarterly floating-rate payments to the Company for the relevant amount based on the three-month USD LIBOR, and the Company effects quarterly payments to the bank on the relevant amount at the respective fixed rates.

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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 Date the entity entered into the derivative contract, in CCYY-MM-DD format. + 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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