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Leases - Lease, Cost (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost $ 1,643,000 $ 1,470,000 $ 4,597,000 $ 4,400,000
Variable lease cost $ 0 $ 0 $ 0 $ 0