Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue from External Customer [Line Items]
Deferred income	$ 74,515	$ 62,319
Revenues	755,073	740,340	$ 657,515
Tenant Funded Improvements
Revenue from External Customer [Line Items]
Deferred income	30,200	31,600
Tenants Expenses
Revenue from External Customer [Line Items]
Revenues	$ 155,500	$ 142,500	$ 122,400