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Acquisitions - Preliminary allocation of total purchase price (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Jun. 19, 2019
Allocation of total purchase price to net assets acquired and liabilities assumed      
Goodwill $ 41,038 $ 41,038  
Superior      
Allocation of total purchase price to net assets acquired and liabilities assumed      
Property and equipment     $ 18,342
Goodwill     6,858
Customer relationships     4,800
Total assets acquired     $ 30,000