Quarterly report pursuant to Section 13 or 15(d)

Acquisitions -2017 Acquisitions (Details)

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Acquisitions -2017 Acquisitions (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2017
Feb. 28, 2017
Jan. 31, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Business Acquisition [Line Items]              
Goodwill $ 359,420     $ 359,420 $ 359,420   $ 259,938
Gain (loss) recognized due to change in fair value of cash consideration         (1,024) $ 251  
Lease Rent Options              
Business Acquisition [Line Items]              
Cash portion of purchase price   $ 298,500          
Deferred cash payment amount related to acquisition   $ 1,500          
Length of time for acquisition deferred cash payment to be made   12 months          
American Utility Management              
Business Acquisition [Line Items]              
Cash portion of purchase price 64,800            
Deferred cash payment amount related to acquisition $ 5,100            
Length of time for acquisition deferred cash payment to be made 4 years            
Total purchase price $ 69,400            
Cash acquired 100            
Goodwill 45,292     45,292 45,292    
Fair value of deferred cash payment 4,600     4,600 4,600    
Axiometrics              
Business Acquisition [Line Items]              
Cash portion of purchase price     $ 66,100        
Deferred cash payment amount related to acquisition     $ 7,500        
Length of time for acquisition deferred cash payment to be made     2 years        
Total purchase price     $ 73,800        
Goodwill 54,154   $ 54,200 54,154 54,154    
Length of time for acquisition contingent cash payment to be made     12 months        
Fair value of deferred cash payment     $ 6,900        
Fair value of contingent cash payment     $ 800        
Contingent cash obligation/payment 5,000     5,000 5,000    
Change in goodwill       1,300      
Adjustment in purchase price allocated to accounts payable and accrued liabilities       900      
Adjustment in purchase price allocated to deferred revenue       400      
2017 Acquisitions              
Business Acquisition [Line Items]              
Contingent cash obligation/payment 600     600 600    
Deferred cash obligation 12,600     12,600 12,600    
Deferred cash obligation discount $ (1,000)     (1,000) (1,000)    
Gain (loss) recognized due to change in fair value of cash consideration       $ 200 $ 200    
Developed product technologies | American Utility Management              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets 3 years            
Developed product technologies | Axiometrics              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets     5 years        
Client relationships | American Utility Management              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets 10 years            
Client relationships | Axiometrics              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets     10 years        
Trade names | American Utility Management              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets 2 years            
Trade names | Axiometrics              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets     3 years        
Non-compete agreements | American Utility Management              
Business Acquisition [Line Items]              
Amortized useful life of acquired intangible assets 5 years