Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
ASSETS
Land and land improvements	$ 1,207,305	$ 1,189,760
Building and improvements	5,305,894	5,343,908
Less accumulated depreciation	(1,205,440)	(1,182,569)
Operating real estate	5,307,759	5,351,099
Development in progress	225,154	277,411
Land held for development	280,334	269,059
Net real estate	5,813,247	5,897,569
Cash and cash equivalents	73,053	69,346
Restricted cash	17,929	20,325
Accounts receivable	14,837	15,481
Deferred rent receivable	115,944	107,909
Deferred financing and leasing costs, net of accumulated amortization (2015, $176,671; 2014, $169,468)	200,782	206,286
Investments in and advances to unconsolidated joint ventures	215,715	208,832
Assets held for sale	0	8,389
Prepaid expenses and other assets	105,223	91,399
Total assets	6,556,730	6,625,536
LIABILITIES
Mortgage loans	481,621	487,301
Unsecured notes	2,608,089	2,509,094
Credit facility	70,000	167,000
Accounts payable	46,393	52,043
Accrued interest	27,176	24,513
Dividend and distributions payable	72,687	72,253
Other liabilities	197,960	219,418
Total liabilities	3,503,926	3,531,622
Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of June 30, 2015 and December 31, 2014	7,537	7,537
EQUITY
Common shares of beneficial interest, $.001 par value, 283,987,000 shares authorized; 150,737,328 (includes 1,249,909 in treasury) and 149,807,179 (includes 1,249,909 in treasury) shares issued and outstanding as of June 30, 2015 and December 31, 2014, respectively	151	150
Additional paid-in capital	3,775,548	3,740,594
Accumulated other comprehensive loss	(4,863)	(6,252)
Distributions in excess of net income	(730,242)	(654,869)
Common shares in treasury, at cost, 1,249,909 shares as of June 30, 2015 and December 31, 2014	(51,951)	(51,951)
Total Liberty Property Trust shareholders' equity	2,988,643	3,027,672
Noncontrolling interest - operating partnership
Noncontrolling interest - operating partnerships	52,705	54,786
Noncontrolling interest - consolidated joint ventures	3,919	3,919
Total equity	3,045,267	3,086,377
Total liabilities, noncontrolling interest - operating partnership and equity	6,556,730	6,625,536
Liberty Property Limited Partnership [Member]
ASSETS
Land and land improvements	1,207,305	1,189,760
Building and improvements	5,305,894	5,343,908
Less accumulated depreciation	(1,205,440)	(1,182,569)
Operating real estate	5,307,759	5,351,099
Development in progress	225,154	277,411
Land held for development	280,334	269,059
Net real estate	5,813,247	5,897,569
Cash and cash equivalents	73,053	69,346
Restricted cash	17,929	20,325
Accounts receivable	14,837	15,481
Deferred rent receivable	115,944	107,909
Deferred financing and leasing costs, net of accumulated amortization (2015, $176,671; 2014, $169,468)	200,782	206,286
Investments in and advances to unconsolidated joint ventures	215,715	208,832
Assets held for sale	0	8,389
Prepaid expenses and other assets	105,223	91,399
Total assets	6,556,730	6,625,536
LIABILITIES
Mortgage loans	481,621	487,301
Unsecured notes	2,608,089	2,509,094
Credit facility	70,000	167,000
Accounts payable	46,393	52,043
Accrued interest	27,176	24,513
Dividend and distributions payable	72,687	72,253
Other liabilities	197,960	219,418
Total liabilities	3,503,926	3,531,622
Noncontrolling interest - operating partnership - 301,483 preferred units outstanding as of June 30, 2015 and December 31, 2014	7,537	7,537
EQUITY
General partner’s equity - 149,487,419 (net of 1,249,909 treasury units) and 148,557,270 (net of 1,249,909 treasury units) common units outstanding as of June 30, 2015 and December 31, 2014, respectively	2,988,643	3,027,672
Limited partners' equity	52,705	54,786
Noncontrolling interest - operating partnership
Noncontrolling interest - consolidated joint ventures	3,919	3,919
Total equity	3,045,267	3,086,377
Total liabilities, noncontrolling interest - operating partnership and equity	$ 6,556,730	$ 6,625,536