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Leases - Lease Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Fixed income from operating leases $ 943,638 $ 853,545 $ 829,774
Variable income from operating leases 238,470 215,957 190,574
Interest income from direct financing leases $ 9,720 $ 16,666 $ 16,349