Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Activity Prior to 2015 (Details)

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Acquisitions - Activity Prior to 2015 (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Business Acquisition [Line Items]      
Gain (loss) recognized due to change in fair value of cash consideration $ (126,000) $ 377,000  
Acquisitions Prior to 2015      
Business Acquisition [Line Items]      
Total deferred cash obligation 5,000,000   $ 7,300,000
Deferred cash payment amount related to acquisition 2,500,000 500,000  
Aggregate contingent cash obligations     $ 0
Payments of contingent cash obligations 0 700,000  
Gain (loss) recognized due to change in fair value of cash consideration $ 0 $ (300,000)