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Fair value measurements - Additional Information (Details) (USD $) In Thousands, unless otherwise specified				6 Months Ended		0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Jun. 30, 2013 Interest Rate Swap A	Jun. 30, 2013 Interest Rate Swap B	Apr. 28, 2014 Fix forward 50% of floating interest rate for HSH Nordbank AG $35,000 facility
Derivative
Number of interest rate derivatives held by the Company	4	2	2			2
Derivative Asset Notional Amount				$ 26,840	$ 28,628
Maturity date				Aug. 31, 2018	Nov. 30, 2018	Sep. 30, 2018
Fixed rate, per annum						1.765%
Variable rate basis						LIBOR

X

- Definition

Nominal or face amount used to calculate payments on the derivative asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 1B

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



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-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Notional Amount

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- Definition

The reference rate for the variable rate of the interest rate derivative, 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.

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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

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- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

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- Definition

Number of interest rate derivative instruments held by the entity at the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

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-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5580258-113959



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