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Business Combinations Business Combinations
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
numberOfConnections
Dec. 31, 2019
USD ($)
May 31, 2020
USD ($)
Business Acquisition [Line Items]          
Goodwill $ 70,292,000 $ 70,292,000 $ 49,333,000 $ 49,929,000  
Goodwill, Impairment Loss   0      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]          
Goodwill 70,292,000 70,292,000 49,333,000 49,929,000  
Suncadia & T&W Water [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred   38,100,000      
Goodwill 19,300,000 19,300,000      
Business Acquisition, Goodwill, Expected Tax Deductible Amount 16,500,000 16,500,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill 0 $ 0      
Number of Businesses Acquired   2      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]          
Goodwill 19,300,000 $ 19,300,000      
Sunriver [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred     $ 55,000,000.0    
Business Acquisition, Connections of Acquired Business | numberOfConnections     9,400    
Goodwill     $ 41,100,000   $ 41,054,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount     50,200,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill     0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets         222,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment         12,866,000
Goodwill     $ 41,100,000   41,054,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets         828,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities         (22,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets         $ 54,948,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual 600,000 1,300,000      
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual $ 1,900,000 4,900,000      
Other insignificant acquisitions [Member]          
Business Acquisition [Line Items]          
Business Combination, Consideration Transferred   $ 1,500,000   $ 2,000,000.0  
Number of Businesses Acquired   2   3