Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
OPERATING ACTIVITIES
Net income	$ 44,244	$ 59,063
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	45,992	54,837
Amortization of deferred financing costs	937	1,002
Equity in earnings of unconsolidated joint ventures	(5,731)	(4,914)
Distributions from unconsolidated joint ventures	0	314
Gain on property dispositions	(807)	(20,521)
Share-based compensation/Non-cash compensation	7,971	14,566
Other	(844)	(1,652)
Changes in operating assets and liabilities:
Restricted cash	1,902	2,216
Accounts receivable	36	(4,030)
Deferred rent receivable	(5,566)	(5,225)
Prepaid expenses and other assets	6,856	(2,926)
Accounts payable	(7,136)	3,762
Accrued interest	12,972	16,976
Other liabilities	(14,444)	(12,627)
Net cash provided by operating activities	86,382	100,841
INVESTING ACTIVITIES
Investment in properties - acquisitions	0	(8,000)
Investment in properties - other	(12,422)	(13,314)
Investments in and advances to unconsolidated joint ventures	(13,278)	(14,635)
Distributions from unconsolidated joint ventures	9,427	26,684
Net proceeds from disposition of properties/land	1,874	127,727
Investment in development in progress	(64,661)	(76,522)
Investment in land held for development	(53,660)	(15,392)
Payment of deferred leasing costs	(7,544)	(8,200)
Investing - Other	9,016	8,095
Net cash (used in) provided by investing activities	(131,248)	26,443
FINANCING ACTIVITIES
Net proceeds from issuance of common shares	852	504
Share repurchase including shares related to tax withholdings	(4,624)	(44,926)
Repayments of mortgage loans	(1,930)	(3,101)
Proceeds from credit facility	159,000	187,000
Repayments on credit facility	(44,000)	(186,000)
Distribution paid on common shares	(69,823)	(70,104)
Distribution paid on units	(1,987)	(1,794)
Net cash provided by (used in) financing activities	37,488	(118,421)
Net (decrease) increase in cash and cash equivalents	(7,378)	8,863
Increase (decrease) in cash and cash equivalents related to foreign currency translation	271	(553)
Cash and cash equivalents at beginning of period	43,642	35,353
Cash and cash equivalents at end of period	36,535	43,663
Liberty Property Limited Partnership [Member]
OPERATING ACTIVITIES
Net income	44,244	59,063
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	45,992	54,837
Amortization of deferred financing costs	937	1,002
Equity in earnings of unconsolidated joint ventures	(5,731)	(4,914)
Distributions from unconsolidated joint ventures	0	314
Gain on property dispositions	(807)	(20,521)
Share-based compensation/Non-cash compensation	7,971	14,566
Other	(844)	(1,652)
Changes in operating assets and liabilities:
Restricted cash	1,902	2,216
Accounts receivable	36	(4,030)
Deferred rent receivable	(5,566)	(5,225)
Prepaid expenses and other assets	6,856	(2,926)
Accounts payable	(7,136)	3,762
Accrued interest	12,972	16,976
Other liabilities	(14,444)	(12,627)
Net cash provided by operating activities	86,382	100,841
INVESTING ACTIVITIES
Investment in properties - acquisitions	0	(8,000)
Investment in properties - other	(12,422)	(13,314)
Investments in and advances to unconsolidated joint ventures	(13,278)	(14,635)
Distributions from unconsolidated joint ventures	9,427	26,684
Net proceeds from disposition of properties/land	1,874	127,727
Investment in development in progress	(64,661)	(76,522)
Investment in land held for development	(53,660)	(15,392)
Payment of deferred leasing costs	(7,544)	(8,200)
Investing - Other	9,016	8,095
Net cash (used in) provided by investing activities	(131,248)	26,443
FINANCING ACTIVITIES
Repayments of mortgage loans	(1,930)	(3,101)
Proceeds from credit facility	159,000	187,000
Repayments on credit facility	(44,000)	(186,000)
Capital contributions	852	504
Distributions to partners/noncontrolling interests	(76,434)	(116,824)
Net cash provided by (used in) financing activities	37,488	(118,421)
Net (decrease) increase in cash and cash equivalents	(7,378)	8,863
Increase (decrease) in cash and cash equivalents related to foreign currency translation	271	(553)
Cash and cash equivalents at beginning of period	43,642	35,353
Cash and cash equivalents at end of period	$ 36,535	$ 43,663