CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
INVESTMENTS IN REAL ESTATE, at cost:
Operating properties	$ 3,193,444	$ 3,180,212
Construction in progress	113,015	113,609
Land held for development	5,881	5,881
Total investments in real estate	3,312,340	3,299,702
Accumulated depreciation	(1,141,914)	(1,111,007)
Net investments in real estate	2,170,426	2,188,695
INVESTMENTS IN PARTNERSHIPS, at equity:	90,188	216,823
OTHER ASSETS:
Cash and cash equivalents	89,213	15,348
Tenant and other receivables (net of allowance for doubtful accounts of $8,107 and $7,248 at March 31, 2018 and December 31, 2017, respectively)	35,671	38,166
Intangible assets (net of accumulated amortization of $13,795 and $13,117 at March 31, 2018 and December 31, 2017, respectively)	17,015	17,693
Deferred costs and other assets, net	114,332	112,046
Total assets	2,516,845	2,588,771
LIABILITIES:
Mortgage loans payable, net	1,062,070	1,056,084
Long-term Debt	547,949	547,758
Revolving Facility		53,000
Tenants’ deposits and deferred rent	13,345	11,446
Distributions in excess of partnership investments	96,895	97,868
Fair value of derivative liabilities		20
Accrued expenses and other liabilities	55,822	61,604
Total liabilities	1,776,081	1,827,780
COMMITMENTS AND CONTINGENCIES (Note 6):
EQUITY:
Shares of beneficial interest, $1.00 par value per share; 200,000 shares authorized; 70,353 and 69,983 issued and outstanding shares at March 31, 2018 and December 31, 2017, respectively	70,353	69,983
Capital contributed in excess of par	1,665,325	1,663,966
Accumulated other comprehensive income		(7,226)
Distributions in excess of net income	(1,142,218)	(1,117,290)
Total equity—Pennsylvania Real Estate Investment Trust	605,402	624,039
Noncontrolling interest	135,362	136,952
Total equity	740,764	760,991
Total liabilities and equity	2,516,845	2,588,771
Series B Preferred Stock [Member]
EQUITY:
Preferred Shares	35	35
Total equity	35	35
Series C Preferred Stock [Member]
EQUITY:
Preferred Shares	69	69
Total equity	69	69
Series D Preferred Stock [Member]
EQUITY:
Preferred Shares	50	50
Total equity	50	50
AOCI Attributable to Parent [Member]
EQUITY:
Total equity	$ 11,788	$ 7,226