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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:        
Operating cash flows from operating leases $ (1,317) $ (2,389)    
Operating lease right-of-use assets obtained in exchange for lease obligations 0 409    
Operating lease right-of-use assets obtained in exchange for lease obligations from acquisitions (398) 0    
Reconciliation of Cash and Cash Equivalents and Restricted Cash:        
Cash and cash equivalents 137,588 155,089 $ 114,422  
Restricted cash 500 504    
Total $ 138,088 $ 155,593 $ 114,927 $ 172,084