CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
INVESTMENTS IN REAL ESTATE, at cost:
Operating properties	$ 3,063,531	$ 3,180,212
Construction in progress	115,182	113,609
Land held for development	5,881	5,881
Total investments in real estate	3,184,594	3,299,702
Accumulated depreciation	(1,118,582)	(1,111,007)
Net investments in real estate	2,066,012	2,188,695
INVESTMENTS IN PARTNERSHIPS, at equity:	131,124	216,823
OTHER ASSETS:
Cash and cash equivalents	18,084	15,348
Tenant and other receivables (net of allowance for doubtful accounts of $6,597 and $7,248 at December 31, 2018 and 2017, respectively)	38,914	38,166
Intangible assets (net of accumulated amortization of $15,543 and $13,117 at December 31, 2018 and 2017, respectively)	17,868	17,693
Deferred costs and other assets, net	110,805	112,046
Assets held for sale	22,307	0
Total assets	2,405,114	2,588,771
LIABILITIES:
Mortgage loans payable, net	1,047,906	1,056,084
Term Loans, net	547,289	547,758
Revolving Facilities	65,000	53,000
Tenants’ deposits and deferred rent	15,400	11,446
Distributions in excess of partnership investments	92,057	97,868
Fair value of derivative instruments	3,010	20
Accrued expenses and other liabilities	87,901	61,604
Total liabilities	1,858,563	1,827,780
COMMITMENTS AND CONTINGENCIES (Note 11)
EQUITY:
Shares of beneficial interest, $1.00 par value per share; 200,000 shares authorized; 70,495 shares issued and outstanding at December 31, 2018 and 69,983 shares issued and outstanding at December 31, 2017	70,495	69,983
Capital contributed in excess of par	1,671,042	1,663,966
Accumulated other comprehensive income	5,408	7,226
Distributions in excess of net income	(1,306,318)	(1,109,469)
Total equity – Pennsylvania Real Estate Investment Trust	440,781	631,860
Noncontrolling interest	105,770	129,131
Total equity	546,551	760,991
Total liabilities and equity	2,405,114	2,588,771
Series A Preferred Shares[Member]
EQUITY:
Total equity	0	0
Series B Preferred Shares [Member]
EQUITY:
Preferred shares, value	35	35
Total equity	35	35
Series C Preferred Stock [Member]
EQUITY:
Preferred shares, value	69	69
Total equity	69	69
Series D Preferred Stock [Member]
EQUITY:
Preferred shares, value	50	50
Total equity	$ 50	$ 50