Annual report pursuant to Section 13 and 15(d)

Acquisitions - Acquisition of Higher Power Narrative (Details)

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Acquisitions - Acquisition of Higher Power Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 05, 2017
May 26, 2017
Apr. 21, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]            
Total consideration transferred $ 25,762 $ 36,320        
Cash paid to acquire a business       $ 0 $ 20,824 $ 42,008 [1]
Higher Power            
Business Acquisition [Line Items]            
Total consideration transferred     $ 4,000      
Transaction related costs expensed           $ 100
[1] (a) Financial information includes the results attributable to Sturgeon for the entire period presented. See Note 4.