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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 28, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease assets $ 22,582 $ 17,522    
Operating lease liabilities 8,110 5,647    
Non-current operating lease liabilities 18,120 12,326    
Operating lease expense 8,180 6,893    
Operating lease payments 8,009 6,530    
Operating lease expense for which no liability or asset was recognized 123 275    
Rent expense     $ 8,186  
Operating lease, liability $ 26,230 $ 17,973    
Operating lease, weighted average discount rate (percent) 4.00% 4.60%    
Operating lease, weighted average remaining lease term (years) 5 years 1 month 6 days 3 years 8 months 12 days    
Carrying value of lease assets       $ 0
Operating lease asset impairment charges $ 3,427 $ 0 0  
Operating lease income 77      
Operating lease income   $ 311 $ 1,116  
Contract Termination [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Operating lease, liability $ 2,877