Leases - Leases under ASC 840 (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
Gross Rents, 2019	$ 29,093
Gross Rents, 2020	29,379
Gross Rents, 2021	28,925
Gross Rents, 2022	27,562
Gross Rents, 2023	25,064
Gross Rents, Thereafter	262,200
Gross Rents, Total lease payments	402,223
Sublease Income, 2019	2,382
Sublease Income, 2020	2,290
Sublease Income, 2021	2,160
Sublease Income, 2022	2,002
Sublease Income, 2023	1,938
Sublease Income, Thereafter	8,558
Sublease Income, Total lease payments	19,330
Net Rents, 2019	26,711
Net Rents, 2020	27,089
Net Rents, 2021	26,765
Net Rents, 2022	25,560
Net Rents, 2023	23,126
Net Rents, Thereafter	253,642
Net rents, total lease payments	$ 382,893