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Acquisitions (Allocation of Purchase Consideration to the Assets Acquired and Liabilities Assumed) (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Aug. 21, 2018
Business Acquisition [Line Items]      
Goodwill $ 324,019 $ 323,671  
SolarBOS      
Business Acquisition [Line Items]      
Cash     $ 915
Working capital     680
Property, plant and equipment     483
Acquired intangible assets     1,450
Other assets     13
Other liabilities     (51)
Goodwill     2,879
Fair value of purchase consideration     $ 6,369