Investment Partnership (Summary of Equity Method Investments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Total assets	$ 834,341	$ 763,870
Leigh Valley Associates, LP
Schedule of Equity Method Investments [Line Items]
Total assets	52,255	43,850		$ 49,264
Mortgage payable	196,328	199,451		$ 126,520
Revenue	35,662	34,945	$ 36,923
Property operating expenses	9,014	9,038	8,659
Interest expense	8,222	10,907	7,570
Net income	15,605	11,389	17,264
PREIT’s share of equity in income of partnership	$ 7,803	$ 5,695	$ 8,632