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Leases (Supplemental Cash Flow Information) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Leases [Abstract]    
Cash paid for amounts included in the measurement of operating leases liabilities $ 5,434,000 $ 5,015,000
Right-of-use assets obtained in exchange for operating lease obligations, net of early lease terminations $ 8,180,000 $ 2,796,000