Investment Partnership (Summary of Equity Method Investments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Total assets	$ 558,346	$ 284,694
Leigh Valley Associates, LP
Schedule of Equity Method Investments [Line Items]
Total assets	51,703	55,592
Mortgage payable	131,394	133,542
Revenues	36,605	35,628
Property operating expenses	10,027	9,817
Interest expense	7,839	7,962
Net income	14,932	14,515
PREIT’s share of equity in income of partnership	$ 7,466	$ 7,258