Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Activity Prior to 2014 (Details)

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Acquisitions - Activity Prior to 2014 (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]          
Gain (loss) recognized due to change in fair value of cash consideration     $ 493 $ (66)  
Acquisitions Prior to 2014          
Business Acquisition [Line Items]          
Fair value of contingent payments $ 500   500   $ 1,800
Gain (loss) recognized due to change in fair value of cash consideration 500 $ 400 600 200  
Payments related to acquisitions 0 $ 200 700 $ 1,000  
Total deferred cash obligation 2,400   2,400   2,400
Deferred cash obligation discount $ 100   $ 100   $ 100
Common Stock | Acquisitions Prior to 2014          
Business Acquisition [Line Items]          
Shares issued in business acquisition 36,250