Significant Accounting Policies - Deferred Leasing Commissions and Revenue Recognition (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) item shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares
Deferred Leasing Commissions
Amortization expense of deferred leasing commissions	$ 5,900	$ 7,100	$ 10,700
Estimated annual amortization of deferred leasing commissions for the succeeding five years
2024	4,466
2025	3,914
2026	3,285
2027	2,883
2028	2,426
2028 and thereafter	6,690
Summary of rental revenue
Income from leases	103,716	107,990	148,705
Reimbursable expenses	42,311	49,736	54,825
Straight line rent adjustments	(626)	5,895	4,017
Amortization of favorable and unfavorable leases	45	118	34
Total	$ 145,446	$ 163,739	$ 207,581
Segment Reporting
Number of reporting segments | item	1
Net Income Per Share
Potential dilutive shares outstanding | shares	0	0	0
Denominator used for calculating basic net income per share (in shares) | shares	103,357,000	103,338,000	106,667,000
Denominator used for calculating diluted net income per share (in shares) | shares	103,357,000	103,338,000	106,667,000
Derivative instruments
Fair value hedges outstanding	$ 0
Rental
Summary of rental revenue
Total	$ 145,446	$ 163,739	$ 207,581