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Leases - Schedule of Quantitative Disclosures for Lessees (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Lease Description      
Total lease cost $ 9,307 $ 8,289 $ 7,955
Ground leases      
Lease Description      
Fixed lease cost 5,727 5,537 5,248
Variable lease cost 639 599 562
Office and other leases      
Lease Description      
Fixed lease cost 2,869 2,114 2,135
Variable lease cost $ 72 $ 39 $ 10