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Fair value measurements - Interest rate swaps (Table) (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2017 USD ($)
Derivatives, Fair Value [Line Items] |
Notional amount | $ 451,088
Interest Rate Swap 1 |
Derivatives, Fair Value [Line Items] |
Counterparty | Goldman Sachs
Inception | Oct. 01, 2014
Expiry | Apr. 01, 2018
Fixed Rate | 1.7925%
Notional amount | $ 98,099
Interest Rate Swap 2 |
Derivatives, Fair Value [Line Items] |
Counterparty | Goldman Sachs
Inception | Oct. 01, 2014
Expiry | Apr. 01, 2018
Fixed Rate | 1.8075%
Notional amount | $ 98,099
Interest Rate Swap 3 |
Derivatives, Fair Value [Line Items] |
Counterparty | Goldman Sachs
Inception | Oct. 01, 2014
Expiry | Apr. 01, 2018
Fixed Rate | 2.0675%
Notional amount | $ 39,240
Interest Rate Swap 4 |
Derivatives, Fair Value [Line Items] |
Counterparty | Goldman Sachs
Inception | Oct. 01, 2014
Expiry | Apr. 01, 2018
Fixed Rate | 1.845%
Notional amount | $ 98,099
Interest Rate Swap 5 |
Derivatives, Fair Value [Line Items] |
Counterparty | Goldman Sachs
Inception | Oct. 01, 2014
Expiry | Apr. 01, 2018
Fixed Rate | 1.8025%
Notional amount | $ 58,860
Interest Rate Swap 6 |
Derivatives, Fair Value [Line Items] |
Counterparty | HSH - Star Challenger
Inception | Sep. 30, 2014
Expiry | Sep. 28, 2018
Fixed Rate | 1.765%
Notional amount | $ 6,719
Interest Rate Swap 7 |
Derivatives, Fair Value [Line Items] |
Counterparty | HSH - Star Fighter
Inception | Sep. 30, 2014
Expiry | Sep. 28, 2018
Fixed Rate | 1.765%
Notional amount | $ 6,854
Interest Rate Swap 8 |
Derivatives, Fair Value [Line Items] |
Counterparty | Credit Agricole - Star Borealis
Inception | Nov. 10, 2014
Expiry | Aug. 09, 2018
Fixed Rate | 1.72%
Notional amount | $ 21,986
Interest Rate Swap 9 |
Derivatives, Fair Value [Line Items] |
Counterparty | Credit Agricole - Star Polaris
Inception | Aug. 11, 2014
Expiry | Nov. 09, 2018
Fixed Rate | 1.705%
Notional amount | $ 23,132

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- Definition Identification of the name or type of counterparty to the derivative instrument. + 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 A -Footnote 1 + Details
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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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