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Property and Equipment (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property Plant And Equipment [Abstract]      
Depreciation and amortization $ 30,128 $ 30,902 $ 26,532
Property and equipment, held for sale $ 1,600 $ 300