CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income (loss)	$ 184,638	$ (89,778)	$ (37,410)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	171,969	168,288	172,301
Gain on acquisition	(167,864)	0	0
Gains on sales of properties	(13,291)	(6,557)	(14,613)
Debt satisfaction (gains) charges, net	8,062	311	(3,590)
Impairment charges and loan losses	9,969	117,443	56,940
Straight-line rents	(7,372)	(1,763)	862
Other non-cash income, net	(1,139)	(6,364)	(7,912)
Equity in earnings of non-consolidated entities	(21,531)	(30,334)	(21,741)
Distributions of accumulated earnings from non-consolidated entities, net	7,498	11,549	3,233
Deferred taxes, net	(186)	(1,799)	489
Increase (decrease) in accounts payable and other liabilities	(598)	1,589	5,186
Change in rent receivable and prepaid rent, net	(1,325)	19,929	12,272
Increase (decrease) in accrued interest payable	(2,473)	(970)	2,921
Other adjustments, net	(2,547)	(1,407)	(4,187)
Net cash provided by operating activities:	163,810	180,137	164,751
Cash flows from investing activities:
Investment in real estate, including intangible assets	(98,083)	(25,811)	(17,250)
Investment in real estate under construction	(113,262)	(69,755)	(11,258)
Capital expenditures	(49,952)	(32,426)	(35,074)
Acquisition of remaining interest in NLS	(9,438)	0	0
Net proceeds from sale of properties	155,240	124,039	80,224
Principal payments received on loans receivable	6,841	46,867	12,480
Investment in loans receivable	(11,470)	(32,591)	(40,632)
Investments in and advances to non-consolidated entities, net	(20,172)	(19,940)	0
Proceeds from sale of interest in non-consolidated entity	7,000	0	112
Distributions from non-consolidated entities in excess of accumulated earnings	351	5,900	1,356
Increase in deferred leasing costs	(14,826)	(15,870)	(5,129)
Change in escrow deposits and restricted cash	5,710	(3,405)	(8,282)
Real estate deposits	(149)	(1,821)	(1,330)
Net cash used in investing activities	(142,210)	(24,813)	(24,783)
Cash flows from financing activities:
Dividends to common and preferred shareholders	(103,295)	(94,861)	(77,252)
Repurchase of exchangeable notes	(62,150)	0	(25,493)
Proceeds from convertible notes	0	0	115,000
Conversion of convertible notes	(2,427)	0	0
Principal amortization payments	(31,252)	(31,068)	(33,781)
Principal payments on debt, excluding normal amortization	(288,094)	(105,266)	(331,295)
Change in revolving credit facility borrowing, net	0	0	(7,000)
Increase in deferred financing costs	(6,431)	(4,214)	(5,760)
Proceeds of mortgages and notes payable	121,000	15,000	59,769
Proceeds from term loans	255,000	0	0
Contributions from noncontrolling interests	889	2	4,854
Cash distributions to noncontrolling interests	(35,381)	(5,811)	(8,356)
Repurchase of preferred shares	(70,000)	(15,456)	0
Receipts (payments) on forward equity commitment, net	0	(2,313)	1,473
Issuance of common shares, net	162,747	99,730	166,652
Net cash used in financing activities	(59,394)	(144,257)	(141,189)
Cash acquired in acquisition of remaining interest in NLS	8,107	0	0
Change in cash and cash equivalents	(29,687)	11,067	(1,221)
Cash and cash equivalents, at beginning of year	63,711	52,644	53,865
Cash and cash equivalents, at end of year	$ 34,024	$ 63,711	$ 52,644