Stock repurchases (Details) (USD $) In Thousands, except Share data, unless otherwise specified	0 Months Ended	6 Months Ended	0 Months Ended
Jun. 30, 2013	Jun. 30, 2013	Apr. 02, 2013 Maximum
Equity, Class of Treasury Stock
Amount of common stock approved by the entity for a stock repurchase program			$ 10,000
Number of shares repurchased and retired under the stock repurchase program		155,000
Value of shares repurchased and retired under the stock repurchase program excluding commissions paid		1,056
Average price under the stock repurchase program (in dollars per share)		$ 6.81
Remaining amount authorized for the share repurchase program	$ 8,944

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Number of shares that have been repurchased and retired during the period.

+ References

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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

+ Details

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- Definition

The remaining repurchase amount authorized by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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- Definition

The amount of common stock approved by the entity for a stock repurchase program in the open market, exclusive of any commissions, markups or expenses.

+ References

No definition available.

+ Details

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- Definition

Equity impact of the value of stock excluding commissions paid that has been repurchased during the period and has not been retired and is not held in treasury.

+ References

No definition available.

+ Details

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- Definition

Represents the average repurchase price per share of the shares that were repurchased during the current period.

+ References

No definition available.

+ Details

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