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Leases - Lease, Cost (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]        
Operating lease cost $ 1,474,000 $ 1,462,000 $ 2,954,000 $ 2,931,000
Variable lease cost $ 0 $ 0 $ 0 $ 0