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Business Combinations Business Combinations (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]      
Goodwill $ 69,220,000 $ 8,954,000 $ 49,929,000
Goodwill, Impairment Loss 0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]      
Goodwill 69,220,000 8,954,000 49,929,000
Suncadia & T&W Water [Member]      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred 38,100,000    
Goodwill 19,100,000    
Business Acquisition, Goodwill, Expected Tax Deductible Amount 17,000,000.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill $ 0    
Number of Businesses Acquired 2    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets [Abstract]      
Goodwill $ 19,100,000    
Sunriver [Member]      
Business Acquisition [Line Items]      
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual $ 1,500,000    
Business Combination, Consideration Transferred   $ 55,000,000.0  
Business Acquisition, Connections of Acquired Business   9,400  
Goodwill   $ 40,355,000  
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   13,565,000  
Goodwill   40,355,000  
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  
Other insignificant acquisitions [Member]      
Business Acquisition [Line Items]      
Business Combination, Consideration Transferred     $ 2,000,000.0
Number of Businesses Acquired     3