Investment Partnership (Summary of Equity Method Investments) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total assets		$ 558,346	$ 655,525
Leigh Valley Associates, LP
Schedule of Equity Method Investments [Line Items]
Total assets		51,703		$ 55,592
Mortgage payable		131,394		$ 133,542
Revenue	$ 35,628	36,605
Property operating expenses	9,817	10,027
Interest expense	7,962	7,839
Net income	14,515	14,932
PREIT’s share of equity in income of partnership	$ 7,258	$ 7,466