CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
INVESTMENTS IN REAL ESTATE, at cost:
Operating properties	$ 3,552,091	$ 3,216,231
Construction in progress	125,525	60,452
Land held for development	8,721	8,721
Total investments in real estate	3,686,337	3,285,404
Accumulated depreciation	(1,083,207)	(1,061,051)
Net investments in real estate	2,603,130	2,224,353
INVESTMENTS IN PARTNERSHIPS, at equity:	155,129	140,882
OTHER ASSETS:
Cash and cash equivalents	31,320	40,433
Tenant and other receivables (net of allowance for doubtful accounts of $12,744 and $11,929 at June 30, 2015 and December 31, 2014, respectively)	34,599	40,566
Intangible assets (net of accumulated amortization of $12,585 and $11,873 at June 30, 2015 and December 31, 2014, respectively)	24,123	6,452
Deferred costs and other assets	88,196	87,017
Total assets	2,958,418	2,539,703
LIABILITIES:
Mortgage loans payable	1,360,795	1,407,947
Long-term Debt	400,000	130,000
Revolving Facility	120,000
Tenants’ deposits and deferred rent	16,344	15,541
Distributions in excess of partnership investments	64,680	65,956
Fair value of derivative liabilities	3,463	2,490
Accrued expenses and other liabilities	91,572	73,032
Total liabilities	$ 2,057,785	$ 1,694,966
COMMITMENTS AND CONTINGENCIES (Note 6):
EQUITY:
Shares of beneficial interest, $1.00 par value per share; 200,000 shares authorized; issued and outstanding 69,167 shares at June 30, 2015 and 68,801 shares at December 31, 2014	$ 69,167	$ 68,801
Capital contributed in excess of par	1,472,590	1,474,183
Accumulated other comprehensive loss	(5,857)	6,002
Distributions in excess of net income	(802,993)	(721,605)
Total equity—Pennsylvania Real Estate Investment Trust	732,988	815,458
Noncontrolling interest	167,645	29,279
Total equity	900,633	844,737
Total liabilities and equity	2,958,418	2,539,703
Assets Held-for-sale, Not Part of Disposal Group, Current	21,921
Real Estate Liabilities Associated with Assets Held for Development and Sale	931
Series A Preferred Shares [Member]
EQUITY:
Preferred Shares	46	46
Series B Preferred Shares [Member]
EQUITY:
Preferred Shares	$ 35	$ 35