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Business Combinations Hetsco Acquisition (Details) - USD ($)
$ in Thousands
 6 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 20, 2017
Mar. 31, 2017
Jan. 13, 2017
Dec. 31, 2016
Business Acquisition [Line Items]            
Goodwill $ 457,481 $ 457,481 $ 227,397     $ 217,970
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net     $ 419,394      
Hetsco [Member]            
Business Acquisition [Line Items]            
Business Acquisition, Percentage of Voting Interests Acquired         100.00%  
Business Combination, Consideration Transferred   23,162        
Other Receivables 380 380        
Goodwill 8,849 8,849   $ 10,120    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 4,693 4,693   4,642    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 22,782 22,782   23,162    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill (1,271)          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 51          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net (380)          
Customer Relationships [Member] | Hetsco [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 8,090 8,090   7,280    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles 810          
Other Identifiable Intangible Assets [Member] | Hetsco [Member]            
Business Acquisition [Line Items]            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles 1,150 $ 1,150   $ 1,120    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles $ 30