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Leases - Lease Income for Operating Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Fixed lease income $ 140,140 $ 133,180
Variable lease income 11,192 9,929
Total lease income $ 151,332 $ 143,109