Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
OPERATING ACTIVITIES    
Net income $ 31,862 $ 74,106
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 59,431 57,589
Amortization of deferred financing costs 1,073 1,510
Impairment - real estate assets 15,739 0
Equity in earnings of unconsolidated joint ventures (6,906) (4,159)
Gain on property dispositions (2,271) (46,117)
Share-based compensation/Non-cash compensation 7,437 6,580
Other (2,990) (635)
Changes in operating assets and liabilities:    
Restricted cash 489 31,726
Accounts receivable (3,670) (4,052)
Deferred rent receivable (5,504) (2,765)
Prepaid expenses and other assets (13,058) (26,557)
Accounts payable (116) 6,562
Accrued interest 12,178 16,441
Other liabilities (3,718) (36,537)
Net cash provided by operating activities 89,976 73,692
INVESTING ACTIVITIES    
Investment in operating properties - acquisitions 0 (37,635)
Investment in operating properties - other (12,805) (16,522)
Investments in and advances to unconsolidated joint ventures (5,822) (429)
Distributions from unconsolidated joint ventures 6,098 2,978
Net proceeds from disposition of properties/land 40,998 327,160
Net (advances on) proceeds from public reimbursement receivable/escrow (1,601) 5,001
Investment in development in progress (48,001) (74,478)
Investment in land held for development (4,045) (1,967)
Investment in deferred leasing costs (9,684) (9,158)
Net cash (used in) provided by investing activities (34,862) 194,950
FINANCING ACTIVITIES    
Net proceeds from issuance of common shares 12,579 15,472
Proceeds from unsecured notes 398,576 0
Repayment of unsecured notes (300,000) 0
Repayments of mortgage loans (2,160) (2,019)
Proceeds from credit facility 390,000 0
Repayments on credit facility (507,000) 0
Payment of deferred financing costs (3,551) (3,619)
Distribution paid on common shares (70,562) (69,634)
Distribution paid on units (1,863) (1,914)
Net cash used in financing activities (83,981) (61,714)
Net (decrease) increase in cash and cash equivalents (28,867) 206,928
(Decrease) increase in cash and cash equivalents related to foreign currency translation (1,724) 211
Cash and cash equivalents at beginning of period 69,346 163,414
Cash and cash equivalents at end of period 38,755 370,553
Liberty Property Limited Partnership [Member]    
OPERATING ACTIVITIES    
Net income 31,862 74,106
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 59,431 57,589
Amortization of deferred financing costs 1,073 1,510
Impairment - real estate assets 15,739 0
Equity in earnings of unconsolidated joint ventures (6,906) (4,159)
Gain on property dispositions (2,271) (46,117)
Share-based compensation/Non-cash compensation 7,437 6,580
Other (2,990) (635)
Changes in operating assets and liabilities:    
Restricted cash 489 31,726
Accounts receivable (3,670) (4,052)
Deferred rent receivable (5,504) (2,765)
Prepaid expenses and other assets (13,058) (26,557)
Accounts payable (116) 6,562
Accrued interest 12,178 16,441
Other liabilities (3,718) (36,537)
Net cash provided by operating activities 89,976 73,692
INVESTING ACTIVITIES    
Investment in operating properties - acquisitions 0 (37,635)
Investment in operating properties - other (12,805) (16,522)
Investments in and advances to unconsolidated joint ventures (5,822) (429)
Distributions from unconsolidated joint ventures 6,098 2,978
Net proceeds from disposition of properties/land 40,998 327,160
Net (advances on) proceeds from public reimbursement receivable/escrow (1,601) 5,001
Investment in development in progress (48,001) (74,478)
Investment in land held for development (4,045) (1,967)
Investment in deferred leasing costs (9,684) (9,158)
Net cash (used in) provided by investing activities (34,862) 194,950
FINANCING ACTIVITIES    
Proceeds from unsecured notes 398,576 0
Repayment of unsecured notes (300,000) 0
Repayments of mortgage loans (2,160) (2,019)
Proceeds from credit facility 390,000 0
Repayments on credit facility (507,000) 0
Payment of deferred financing costs (3,551) (3,619)
Capital contributions 12,579 15,472
Distributions to partners (72,425) (71,548)
Net cash used in financing activities (83,981) (61,714)
Net (decrease) increase in cash and cash equivalents (28,867) 206,928
(Decrease) increase in cash and cash equivalents related to foreign currency translation (1,724) 211
Cash and cash equivalents at beginning of period 69,346 163,414
Cash and cash equivalents at end of period $ 38,755 $ 370,553