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 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Business Acquisition [Line Items]          
Gain (loss) recognized due to change in fair value of cash consideration     $ (251,000) $ 493,000  
Acquisitions Prior to 2015          
Business Acquisition [Line Items]          
Total deferred cash obligation $ 4,500,000   4,500,000   $ 7,300,000
Deferred cash payment amount related to acquisition     2,900,000 600,000  
Aggregate contingent cash obligations 0   0   $ 0
Payments of contingent cash obligations   $ 700,000 0    
Gain (loss) recognized due to change in fair value of cash consideration $ 0 $ (100,000) $ 0 $ (400,000)