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Property Rental Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Property Rental Revenue        
Fixed $ 114,100 $ 109,321 $ 339,321 $ 326,866
Variable 11,800 9,359 31,639 27,653
Property rental revenue $ 125,900 $ 118,680 $ 370,960 $ 354,519