Summary of Significant Accounting Policies Supplemental Disclosures Related to Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental cash flow information
Total interest costs incurred	$ 61,578	$ 54,510	$ 54,636
Interest capitalized	2,991	1,070	628
Interest expense	58,587	53,440	54,008
Cash paid for interest, net of amounts capitalized	50,970	53,467	51,975
Cash paid for income taxes	356	844	971
Supplemental schedule of noncash investing and financing activities
Accounts payable and accrued liabilities for construction in progress	18,697	22,884	25,413
Accrued leasing commissions	2,628	555	3,345
Building recorded in termination of ground lease	$ 0	$ 0	$ 4,518