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Property and Equipment, Net (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Property and Equipment, Net [Abstract]      
Depreciation expense $ 71,500 $ 71,800  
Unpaid capital expenditures $ 5,330   $ 6,073