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Leases - Supplemental Cash flow Information to operating leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Supplemental cash flow information    
Cash paid for amounts included in the measurement of operating lease liabilities $ 8,736 $ 8,479
Operating ROU assets obtained in exchange for lease liabilities 1,427 1,319
Supplemental balance sheet information    
Operating lease ROU assets 34,382 40,049
Operating lease liabilities:    
Accrued expenses and other current liabilities 6,708 7,079
Operating lease liabilities 28,579 34,242
Total operating lease liabilities $ 35,287 $ 41,321