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Acquisitions - Pro forma information and acquisition cost (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 19, 2019
Pro forma information                        
Total Revenue $ 51,610 $ 48,263 $ 53,620 $ 71,655 $ 76,113 $ 81,643 $ 81,358 $ 81,982 $ 225,148 $ 321,096 $ 240,600  
Income (loss) before income taxes                 $ (35,933) 13,843 16,711  
Acquisition related cost               $ 38,100        
Signor                        
Pro forma information                        
Revenue, if acquired beginning of the year                     301,842  
Income before taxes, if acquired beginning of the year                     35,975  
Total Revenue                     30,100  
Income (loss) before income taxes                     12,500  
Superior                        
Pro forma information                        
Revenue, if acquired beginning of the year                   325,845 252,706  
Income before taxes, if acquired beginning of the year                   15,557 $ 20,553  
Total Revenue                   7,800    
Income (loss) before income taxes                   4,000    
Acquisition related cost                   $ 400    
Goodwill expected to be deductible for tax purposes                       $ 6,900