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Leases - Minimum and Contingent Operating Lease Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]      
Minimum rental income $ 77,946    
Minimum rental income   $ 136,612 $ 126,192
Contingent rental income 56,889    
Contingent rental income   57,807 52,347
Total rental income $ 134,835    
Total rental income   $ 194,419 $ 178,539