Investments in Partnerships - Summary of Equity Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Investments in real estate, at cost:
Operating properties	$ 847,560	$ 824,328
Construction in progress	6,456	20,632
Total investments in real estate	854,016	844,960
Accumulated depreciation	(247,133)	(224,641)
Net investments in real estate	606,883	620,319
Cash and cash equivalents	59,004	28,060
Deferred costs and other assets, net	155,247	161,465
Total assets	821,134	809,844
LIABILITIES AND PARTNERS’ INVESTMENT:
Mortgage loans payable, net	493,904	491,119
FDP Term Loan, net	194,602	201,000
Partnership Loan	115,543	100,000
Other liabilities	141,619	132,715
Total liabilities	945,668	924,834
Net investment	(124,534)	(114,990)
Partners’ share	(62,771)	(59,080)
PREIT’s share	(61,763)	(55,910)
Excess investment	6,718	6,390
Net investments and advances	(55,045)	(49,520)
Investment in partnerships, at equity	16,525	27,066
Distributions in excess of partnership investments	$ (71,570)	$ (76,586)