Business Segments - Summary of Information for Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Summary information for the reportable segments
Rental and other property revenues	$ 39,804	$ 38,309
Property operating expenses	16,942	15,349
Other operating expenses not allocated to segments	27,028	21,109
Total operating expenses	43,970	36,458
Proportionate property net operating income (loss)	(4,166)	1,851
Other items included in income (loss) before income tax benefit	20,500	681
Income before income tax benefit	16,334	2,532
Segment Reconciling Items [Member]
Summary information for the reportable segments
Rental and other property revenues	1,830	1,671
Property operating expenses	1,706	1,547
Total operating expenses	1,706	1,547
Proportionate property net operating income (loss)	124	124
Income before income tax benefit	124	124
Corporate Non-Segment [Member]
Summary information for the reportable segments
Rental and other property revenues	1
Property operating expenses	1,214	2,302
Other operating expenses not allocated to segments	27,028	21,109
Total operating expenses	28,242	23,411
Proportionate property net operating income (loss)	(28,241)	(23,411)
Other items included in income (loss) before income tax benefit	20,500	681
Income before income tax benefit	(7,741)	(22,730)
Development and Redevelopment [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	2,257
Property operating expenses	1,867
Total operating expenses	1,867
Proportionate property net operating income (loss)	390
Income before income tax benefit	390
Operating Portfolio Segment [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	32,689	33,361
Property operating expenses	11,170	10,510
Total operating expenses	11,170	10,510
Proportionate property net operating income (loss)	21,519	22,851
Income before income tax benefit	21,519	22,851
Other [Member] | Operating Segments [Member]
Summary information for the reportable segments
Rental and other property revenues	3,027	3,277
Property operating expenses	985	990
Total operating expenses	985	990
Proportionate property net operating income (loss)	2,042	2,287
Income before income tax benefit	$ 2,042	$ 2,287