CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Net income (loss)	$ 29,382	$ (35,678)
Depreciation	99,163	94,659
Amortization	9,932	11,655
Straight-line rent adjustments	(1,032)	(1,292)
Provision for doubtful accounts	1,872	2,260
Amortization of deferred compensation	6,246	8,208
Loss on hedge ineffectiveness	3,409
Gains on sales of real estate	(78,351)
Equity in income of partnerships, net of distributions	(2,496)
Amortization of historic tax credits	(2,494)	(1,810)
Impairment of assets and expensed project costs	30,416
Change in assets and liabilities:
Net change in other assets	(5,051)	(8,997)
Net change in other liabilities	(6,470)	7,864
Net cash provided by operating activities	84,526	76,869
Cash flows from investing activities:
Investments in consolidated real estate acquisitions	(60,879)
Additions to construction in progress	(24,524)	(32,008)
Investments in real estate improvements	(25,191)	(24,303)
Cash proceeds from sales of real estate	173,280
Additions to leasehold improvements	(212)	(693)
Investments in partnerships	(207)	(3,640)
Capitalized leasing costs	(3,902)	(4,137)
Increase in cash escrows	1,600	151
Cash distributions from partnerships in excess of equity in income	1,257	2,005
Net cash provided by (used in) investing activities	61,222	(62,625)
Cash flows from financing activities:
Net proceeds from issuance of common shares	220,300
Net proceeds from issuance of preferred shares		110,896
Repayments of Term Loan	(182,000)
Net borrowings from (repayments of) Revolving Facility	90,000	(80,000)
Repayment of Exchangeable Notes		(136,900)
Proceeds from mortgage loans	76,692	467,750
Principal installments on mortgage loans	(12,698)	(15,714)
Repayments of mortgage loans	(294,514)	(320,731)
Payment of deferred financing costs	(3,764)	(1,817)
Dividends paid to common shareholders	(34,674)	(26,778)
Dividends paid to preferred shareholders	(11,886)	(3,821)
Distributions paid to Operating Partnership unit holders	(1,198)	(1,099)
Value of shares of beneficial interest issued	1,315	1,413
Value of shares retired under equity incentive plans, net of shares issued	(2,418)	(2,993)
Net cash used in financing activities	(154,845)	(9,794)
Net change in cash and cash equivalents	(9,097)	4,450
Cash and cash equivalents, beginning of period	33,990	21,798
Cash and cash equivalents, end of period	$ 24,893	$ 26,248