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Treasury stock / share repurchase program (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2015 | Mar. 31, 2015 | Feb. 28, 2015 | Apr. 30, 2015
Class of Stock [Line Items] |  |  |  |
Investment Repurchase Agreement, Date of Agreement |  |  |  | Feb. 05, 2015
Stock Repurchase Program Expiration Date |  |  |  | Dec. 31, 2015
Treasury Stock, Shares | 0us-gaap_TreasuryStockShares | 17us-gaap_TreasuryStockShares | 28us-gaap_TreasuryStockShares | 0us-gaap_TreasuryStockShares
Treasury Stock Acquired, Average Cost Per Share | $ 0.00us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 6.27us-gaap_TreasuryStockAcquiredAverageCostPerShare | $ 6.64us-gaap_TreasuryStockAcquiredAverageCostPerShare |
Treasury Stock Acquired, Repurchase Authorization | $ 2,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 |  |  | $ 2,000us-gaap_StockRepurchaseProgramAuthorizedAmount1

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- Definition Date the repurchase agreement was made. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 12 -Footnote 2 + Details
Name: | invest_InvestmentRepurchaseAgreementDateOfAgreement
Namespace Prefix: | invest_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_ClassOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramExpirationDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
Name: | us-gaap_TreasuryStockAcquiredAverageCostPerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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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Data Type: | xbrli:sharesItemType
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Period Type: | instant