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Business Combinations Hetsco Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Jan. 13, 2017
Dec. 31, 2016
Business Acquisition [Line Items]          
Goodwill $ 228,237 $ 228,237     $ 217,970
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, Finite-Lived Intangibles 9,240 9,240 8,400    
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, Intangibles 840        
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)