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Leases - Lease, Cost (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 1,147,000 $ 1,657,000 $ 3,394,000 $ 4,060,000
Variable lease cost $ 0 $ 0 $ 0 $ 0