Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Acquisition of Higher Power Narrative (Details)

v3.10.0.1
Acquisitions - Acquisition of Higher Power Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended
Apr. 21, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Business Acquisition [Line Items]        
Cash paid to acquire a business   $ 13,356 $ 39,570  
Higher Power        
Business Acquisition [Line Items]        
Cash paid to acquire a business $ 3,300      
Business combination, contingent consideration, liability $ 800      
Business combination, contingent consideration, payment term 3 years      
Transaction related costs expensed       $ 100
Accrued Liabilities | Higher Power        
Business Acquisition [Line Items]        
Business combination, contingent consideration, liability   300    
Other Liabilities | Higher Power        
Business Acquisition [Line Items]        
Business combination, contingent consideration, liability   $ 300