Annual report pursuant to Section 13 and 15(d)

Acquisitions - Acquisition of Higher Power Narrative (Details)

v3.19.1
Acquisitions - Acquisition of Higher Power Narrative (Details) - USD ($)
 12 Months Ended
Apr. 21, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
 [2]
Business Acquisition [Line Items]        
Cash paid to acquire a business   $ 20,824,000 $ 42,008,000 [1] $ 0
Higher Power        
Business Acquisition [Line Items]        
Total consideration transferred $ 4,000,000      
Cash paid to acquire a business 3,300,000      
Business combination, contingent consideration, liability $ 800,000      
Business combination, contingent consideration, payment term 3 years      
Transaction related costs expensed     100,000  
Revenues   220,281,000 39,571,000  
Depreciation   7,100,000 2,000,000  
Intercompany elimination | Higher Power        
Business Acquisition [Line Items]        
Revenues   $ 191,200,000 $ 27,400,000  
[1] Financial information includes the results attributable to Sturgeon for the entire period presented. See Note 4.
[2] Financial information has been recast to include results attributable to Sturgeon. See Note 4.