Reportable Segments - Reconciliation of Net Income to Net Operating Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net Operating Income	$ 123,051	$ 122,705	$ 242,658	$ 245,829
Net operating income from unconsolidated joint ventures	(2,542)	(5,437)	(5,261)	(10,191)
Total Revenues	185,680	186,637	372,578	376,187
Reimbursed expenses	(677)	(398)	(1,037)	(766)
General and administrative expenses	(6,996)	(7,313)	(15,059)	(14,046)
Interest expense	(16,549)	(16,656)	(32,074)	(33,864)
Depreciation and amortization	(69,861)	(71,456)	(140,605)	(142,326)
Other expenses	(425)	(824)	(646)	(1,414)
Income from unconsolidated joint ventures	5,280	1,795	6,404	3,698
Gain on sales of investments in unconsolidated joint ventures	0	0	0	39
Gain (loss) on investment property transactions	28	(9)	(41)	(26)
Loss on extinguishment of debt	(100)	0	(100)	0
Net income	34,164	28,060	62,327	57,371
Fee income
Segment Reporting Information [Line Items]
Total Revenues	2,305	4,803	3,693	9,332
Termination fee income
Segment Reporting Information [Line Items]
Total Revenues	449	782	1,911	824
Other
Segment Reporting Information [Line Items]
Total Revenues	$ 201	$ 68	$ 2,484	$ 282