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Income taxes Significant Components of our Deferred Tax Assets & Liabilities - Additional Info (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Components of Deferred Tax Assets and Liabilities [Abstract]  
Net operating losses that will increase equity if and when such deferred tax assets are realized $ 7,499us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation