Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details)

v3.3.1.900
Summary of Significant Accounting Policies - Goodwill and Intangible Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 30, 2013
Feb. 28, 2013
Goodwill [Line Items]          
Impairment of goodwill $ 0 $ 0      
Goodwill recorded for acquisitions $ 59,085 60,479 $ 53,074    
Minimum          
Goodwill [Line Items]          
Intangible assets amortization period 1 year        
Maximum          
Goodwill [Line Items]          
Intangible assets amortization period 15 years        
ESP          
Goodwill [Line Items]          
Security deposit with third-party escrow agent       $ 778  
Goodwill recorded for acquisitions   $ 3,682   2,632  
Ennovate          
Goodwill [Line Items]          
Security deposit with third-party escrow agent         $ 1,200
Goodwill recorded for acquisitions       $ 1,050