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Leases (Maturity Schedule) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Lessee, Operating Lease, Liability, Payment, Due [Abstract]      
Less: current obligations $ (81,308) $ (65,466) $ (64,456)
Operating Lease, Liability, Noncurrent $ 356,766 $ 353,181 $ 364,300