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Fair value measurements (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended	1 Months Ended
	Jun. 30, 2012 Revolving Credit Facility	Dec. 31, 2011 Revolving Credit Facility	Jun. 30, 2012 Revolving Credit Facility LIBOR	Dec. 31, 2011 Revolving Credit Facility LIBOR	Jun. 30, 2012 Recurring Fair value	Dec. 31, 2011 Recurring Fair value	Jun. 30, 2012 Recurring Level 2	Dec. 31, 2011 Recurring Level 2
Fair value of financial assets and liabilities
Cross currency hedge					$ 2,321	$ 1,011	$ 2,321	$ 1,011
Variable rate basis	LIBOR	LIBOR	one month LIBOR rate of 0.25%
Margin on variable rate (as a percent)			3.00%	3.00%

X

- Definition

The percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fair value as of the balance sheet date of all foreign currency derivative liabilities designated as cash flow hedging instruments.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4B

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=6935481&loc=SL5624163-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant