CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
INVESTMENTS IN REAL ESTATE, at cost:
Operating properties	$ 3,184,656	$ 3,180,212
Construction in progress	121,204	113,609
Land held for development	5,881	5,881
Total investments in real estate	3,311,741	3,299,702
Accumulated depreciation	(1,169,709)	(1,111,007)
Net investments in real estate	2,142,032	2,188,695
INVESTMENTS IN PARTNERSHIPS, at equity:	120,915	216,823
OTHER ASSETS:
Cash and cash equivalents	19,294	15,348
Tenant and other receivables (net of allowance for doubtful accounts of $7,246 and $7,248 at September 30, 2018 and December 31, 2017, respectively)	33,801	38,166
Intangible assets (net of accumulated amortization of $14,791 and $13,117 at September 30, 2018 and December 31, 2017, respectively)	17,360	17,693
Deferred costs and other assets, net	131,043	112,046
Assets Held-for-sale, Not Part of Disposal Group, Current	15,874
Total assets	2,480,319	2,588,771
LIABILITIES:
Mortgage loans payable, net	1,052,138	1,056,084
Long-term Debt	547,108	547,758
Revolving Facilities	37,000	53,000
Tenants’ deposits and deferred rent	10,155	11,446
Distributions in excess of partnership investments	92,682	97,868
Derivative Liability		20
Accrued expenses and other liabilities	71,862	61,604
Total liabilities	1,810,945	1,827,780
COMMITMENTS AND CONTINGENCIES (Note 6):
EQUITY:
Shares of beneficial interest, $1.00 par value per share; 200,000 shares authorized; 70,473 and 69,983 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	70,473	69,983
Capital contributed in excess of par	1,669,239	1,663,966
Accumulated other comprehensive income		(7,226)
Distributions in excess of net income	(1,205,896)	(1,109,469)
Total equity—Pennsylvania Real Estate Investment Trust	550,475	631,860
Noncontrolling interest	118,899	129,131
Total equity	669,374	760,991
Total liabilities and equity	2,480,319	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	$ 16,505	$ 7,226