Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net income	$ 97,062	$ 110,120
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	92,310	109,047
Amortization of deferred financing costs	1,874	2,004
Equity in earnings of unconsolidated joint ventures	(9,721)	(10,497)
Gain on property dispositions	(6,702)	(24,353)
Share-based compensation/Non-cash compensation	10,500	15,663
Other	(1,712)	(4,424)
Changes in operating assets and liabilities:
Restricted cash	(5,102)	3,390
Accounts receivable	630	1,794
Deferred rent receivable	(10,851)	(8,897)
Prepaid expenses and other assets	10,459	312
Accounts payable	(4,154)	3,877
Accrued interest	(160)	342
Other liabilities	3,399	(17,342)
Net cash provided by operating activities	177,832	181,036
INVESTING ACTIVITIES
Investment in properties - acquisitions	(19,838)	(8,000)
Investment in properties - other	(25,562)	(30,338)
Investments in and advances to unconsolidated joint ventures	(25,333)	(31,372)
Distributions from unconsolidated joint ventures	12,178	35,250
Net proceeds from disposition of properties/land	26,220	139,814
Investment in development in progress	(136,030)	(175,744)
Investment in land held for development	(87,255)	(36,855)
Payment of deferred leasing costs	(18,750)	(15,057)
Investing - Other	26,315	7,842
Net cash used in investing activities	(248,055)	(114,460)
FINANCING ACTIVITIES
Net proceeds from issuance of common shares	4,223	4,341
Share repurchase including shares related to tax withholdings	(4,668)	(45,006)
Repayments of mortgage loans	(3,876)	(22,123)
Proceeds from credit facility	284,000	338,300
Repayments on credit facility	(107,000)	(202,300)
Distribution paid on common shares	(128,703)	(139,742)
Distribution paid on units	(3,569)	(3,847)
Net cash provided by (used in) financing activities	40,407	(70,377)
Net decrease in cash and cash equivalents	(29,816)	(3,801)
Increase (decrease) in cash and cash equivalents related to foreign currency translation	922	(2,212)
Cash and cash equivalents at beginning of period	43,642	35,353
Cash and cash equivalents at end of period	14,748	29,340
Liberty Property Limited Partnership [Member]
OPERATING ACTIVITIES
Net income	97,062	110,120
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	92,310	109,047
Amortization of deferred financing costs	1,874	2,004
Equity in earnings of unconsolidated joint ventures	(9,721)	(10,497)
Gain on property dispositions	(6,702)	(24,353)
Share-based compensation/Non-cash compensation	10,500	15,663
Other	(1,712)	(4,424)
Changes in operating assets and liabilities:
Restricted cash	(5,102)	3,390
Accounts receivable	630	1,794
Deferred rent receivable	(10,851)	(8,897)
Prepaid expenses and other assets	10,459	312
Accounts payable	(4,154)	3,877
Accrued interest	(160)	342
Other liabilities	3,399	(17,342)
Net cash provided by operating activities	177,832	181,036
INVESTING ACTIVITIES
Investment in properties - acquisitions	(19,838)	(8,000)
Investment in properties - other	(25,562)	(30,338)
Investments in and advances to unconsolidated joint ventures	(25,333)	(31,372)
Distributions from unconsolidated joint ventures	12,178	35,250
Net proceeds from disposition of properties/land	26,220	139,814
Investment in development in progress	(136,030)	(175,744)
Investment in land held for development	(87,255)	(36,855)
Payment of deferred leasing costs	(18,750)	(15,057)
Investing - Other	26,315	7,842
Net cash used in investing activities	(248,055)	(114,460)
FINANCING ACTIVITIES
Repayments of mortgage loans	(3,876)	(22,123)
Proceeds from credit facility	284,000	338,300
Repayments on credit facility	(107,000)	(202,300)
Capital contributions	4,223	4,341
Distributions to partners/noncontrolling interests	(136,940)	(188,595)
Net cash provided by (used in) financing activities	40,407	(70,377)
Net decrease in cash and cash equivalents	(29,816)	(3,801)
Increase (decrease) in cash and cash equivalents related to foreign currency translation	922	(2,212)
Cash and cash equivalents at beginning of period	43,642	35,353
Cash and cash equivalents at end of period	$ 14,748	$ 29,340