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Leases - Facility Lease Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases, Operating [Abstract]      
Cash basis payment - operating leases     $ 324,870
Straight-line lease (income) expense     (17,218)
Amortization of deferred gain $ 0 $ 0 (4,358)
Facility lease expense     $ 303,294