CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 1,629	$ (7,487)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	62,992	74,812
Amortization of deferred financing costs	2,730	1,258
Straight-lining of rental income	(20,147)	(19,869)
Amortization of above and below-market leases, net	(3,008)	3,619
Debt breakage costs	2,715
Unrealized gain on interest rate swaps	(1,802)	(6,860)
Realized and unrealized (gains) losses on marketable securities	(1,607)	293
(Income) loss from unconsolidated real estate funds	(288)	326
Distributions of earnings from unconsolidated real estate funds	62	79
Income from unconsolidated joint ventures	(1,937)	(1,496)
Distributions of earnings from unconsolidated joint ventures	24	1,584
Amortization of stock-based compensation expense	3,429	3,627
Other non-cash adjustments	(64)	842
Changes in operating assets and liabilities:
Accounts and other receivables	2,687	(1,362)
Deferred charges	(6,654)	(3,617)
Other assets	(13,678)	(26,038)
Accounts payable and accrued expenses	(8,355)	62,019
Deferred income taxes	(151)	(714)
Other liabilities	(861)	1,023
Net cash provided by operating activities	17,716	82,039
CASH FLOWS FROM INVESTING ACTIVITIES:
Investment in unconsolidated joint venture	(27,857)
Changes in restricted cash	(24,439)	(600)
Additions to rental properties	(15,087)	(33,193)
Distributions of capital from unconsolidated real estate funds	3,845
Net cash used in investing activities	(63,538)	(33,793)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from notes and mortgages payable	991,556
Repayments of notes and mortgages payable	(873,642)	(354)
Repayment of borrowings under revolving credit facility	(65,000)	(20,000)
Borrowings under revolving credit facility	35,000	40,000
Distributions to noncontrolling interests	(32,012)
Dividends paid to common stockholders	(21,851)	(20,151)
Settlement of interest rate swap liabilities	(19,425)
Contributions from noncontrolling interests	7,472
Debt issuance costs	(7,338)
Distributions paid to common unitholders	(3,300)	(4,917)
Debt breakage costs	(2,715)
Repurchase of shares related to stock compensation agreements and related tax withholdings	(154)
Net cash provided by (used in) financing activities	8,591	(5,422)
Net (decrease) increase in cash and cash equivalents	(37,231)	42,824
Cash and cash equivalents at beginning of period	162,965	143,884
Decrease in cash due to deconsolidation of real estate fund investments		(7,987)
Cash and cash equivalents at end of period	125,734	178,721
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash payments for interest	41,375	34,083
Cash payments for income taxes, net of refunds	1,090	417
NON-CASH TRANSACTIONS:
Dividends and distributions declared but not yet paid	25,207	25,147
Change in fair value of interest rate swaps	(4,032)	29,867
Common shares issued upon redemption of common units	21,816	14,427
Additions to real estate included in accounts payable and accrued expenses	4,712	11,064
Purchases of marketable securities using restricted cash	1,615	170
Write-off of fully amortized and/or depreciated assets	$ 2,306	2,795
(Decrease) increase due to deconsolidation of real estate fund investments:
Real estate fund investments		(416,438)
Loans payable to noncontrolling interests		(45,662)
Investments in unconsolidated real estate funds		27,292
Noncontrolling interests in consolidated real estate funds		$ (351,035)