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Goodwill - Narrative (Details) - USD ($)
12 Months Ended
Sep. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Goodwill   $ 543,918,000 $ 445,355,000 $ 445,355,000
Measurement period adjustment   719,000 0  
Goodwill impairment loss   $ 0 $ 0  
MBT        
Business Acquisition [Line Items]        
Goodwill $ 98,563,000      
Measurement period adjustment $ 719,000