Supplemental Financial Statement Information - Cash flow, etc. (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Supplemental Cash Flow Information
Increase in accounts payable and accrued liabilities related to additions to real estate assets			$ 6,910	$ 553
Interest paid
Interest payments	$ 1,727	$ 1,752	5,117	5,198
Interest capitalized included in interest payments	470	57	815	90
Income tax rate
Income tax (provision) benefit	$ (24)	$ 241	$ (24)	$ 500
Income tax benefit rate (as a percent)				23.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%