Operating Leases - Schedule of Future Minimum Rental Revenues (Details)	Dec. 31, 2020 USD ($)
Operating Leases, Future Minimum Payments Receivable, Current	$ 95,378,000
Operating Leases, Future Minimum Payments Receivable, in Two Years	87,750,000
Operating Leases, Future Minimum Payments Receivable, in Three Years	81,315,000
Operating Leases, Future Minimum Payments Receivable, in Four Years	69,499,000
Operating Leases, Future Minimum Payments Receivable, in Five Years	57,783,000
Operating Leases, Future Minimum Payments Receivable, Thereafter	211,728,000
Operating Leases, Future Minimum Payments Receivable	603,453,000
New Market Properties [Member]
Operating Leases, Future Minimum Payments Receivable, Current	74,105,000
Operating Leases, Future Minimum Payments Receivable, in Two Years	66,206,000
Operating Leases, Future Minimum Payments Receivable, in Three Years	55,384,000
Operating Leases, Future Minimum Payments Receivable, in Four Years	43,289,000
Operating Leases, Future Minimum Payments Receivable, in Five Years	31,593,000
Operating Leases, Future Minimum Payments Receivable, Thereafter	91,229,000
Operating Leases, Future Minimum Payments Receivable	361,806,000
Office Building [Member]
Operating Leases, Future Minimum Payments Receivable, Current	21,273,000
Operating Leases, Future Minimum Payments Receivable, in Two Years	21,544,000
Operating Leases, Future Minimum Payments Receivable, in Three Years	25,931,000
Operating Leases, Future Minimum Payments Receivable, in Four Years	26,210,000
Operating Leases, Future Minimum Payments Receivable, in Five Years	26,190,000
Operating Leases, Future Minimum Payments Receivable, Thereafter	120,499,000
Operating Leases, Future Minimum Payments Receivable	$ 241,647,000