CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net (loss) income	$ 16,798	$ (22,817)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	65,430	62,860
Amortization	6,995	8,175
Straight-line rent adjustments	(757)	(326)
Provision for doubtful accounts	1,103	1,420
Amortization of deferred compensation	4,422	4,691
Loss on hedge ineffectiveness	2,693
Gains on sales of real estate	(33,254)
Equity in income of partnerships, net of distributions	(1,623)
Change in assets and liabilities:
Net change in other assets	10,330	8,563
Net change in other liabilities	(14,372)	460
Net cash provided by operating activities	57,765	63,026
Cash flows from investing activities:
Investments in consolidated real estate acquisitions, net of cash acquired	(60,879)
Additions to construction in progress	(13,775)	(19,724)
Investments in real estate improvements	(11,224)	(10,190)
Cash proceeds from sales of real estate	126,895
Additions to leasehold improvements	(145)	(422)
Investments in partnerships	(166)	(3,598)
Capitalized leasing costs	(2,722)	(2,501)
Increase in cash escrows	(470)	(7,779)
Cash distributions from partnerships in excess of equity in income	577	1,672
Net cash provided by (used in) investing activities	38,091	(42,542)
Cash flows from financing activities:
Net proceeds from issuance of common shares	220,300
Net proceeds from issuance of preferred shares		110,750
Repayment of Term Loan	(182,000)
Net borrowing from (repayment of) Revolving Facility	35,000	(30,000)
Repayment of Exchangeable Notes		(136,900)
Proceeds from mortgage loans	76,692	65,750
Principal installments on mortgage loans	(8,447)	(11,120)
Repayment of mortgage loans	(217,524)	(4,000)
Payment of deferred financing costs	(3,613)	(721)
Dividends paid to common shareholders	(22,402)	(17,276)
Dividends paid to preferred shareholders	(7,924)	(1,449)
Distributions paid to Operating Partnership unit holders	(813)	(717)
Shares of beneficial interest issued, net of shares issued	828	539
Shares retired under equity incentive plans, net of shares issued	(2,418)	(2,556)
Net cash used in financing activities	(112,321)	(27,700)
Net change in cash and cash equivalents	(16,465)	(7,216)
Cash and cash equivalents, beginning of period	33,990	21,798
Cash and cash equivalents, end of period	$ 17,525	$ 14,582