CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flow from operating activities:
Net loss	$ (25,329)	$ (19,397)	$ (247,721)
Adjustments to reconcile net loss to net cash flow provided by operating activities:
Depreciation and amortization	251,085	230,332	227,304
Stock-based compensation	7,553	7,439	6,459
Amortization of deferred finance costs and settled interest rate protection agreements	14,110	14,737	13,269
Accretion of convertible debt discount	10,884	14,914	8,204
Loss (gain) on debt retirement, net	505	89	(485)
(Gain) loss on equity derivative instruments	0	(21,926)	40,157
Settlement of accreted debt discount on repurchase of senior convertible notes	(17,294)	(9,937)	(8,358)
Net cash paid from interest rate hedging contracts	(4,689)	(2,285)	0
Equity in net income of joint ventures	(35,250)	(13,734)	(5,600)
Impairment of joint venture investments	26,671	2,921	227
Net gain on change in control and sale of interests	(78,127)	(29,886)	(5,221)
Operating cash distributions from joint ventures	13,165	9,424	7,334
Gain on disposition of real estate	(9,710)	(47,242)	(7,093)
Impairment charges and loan loss reserves	130,771	130,844	171,900
Premium on issuance of senior notes	13,835
Change in notes receivable accrued interest	(6,314)	(1,784)	(3,005)
Change in restricted cash	3,290	(4,317)	(10,876)
Net change in accounts receivable	326	7,358	21,045
Net change in accounts payable and accrued expenses	2,580	1,760	4,323
Net change in other operating assets and liabilities	6,134	3,885	66,261
Total adjustments	329,525	292,592	525,845
Net cash flow provided by operating activities	304,196	273,195	278,124
Cash flow from investing activities:
Proceeds from disposition of real estate	172,231	344,231	156,374
Real estate developed or acquired, net of liabilities assumed	(586,904)	(217,861)	(164,391)
Equity contributions to joint ventures	(54,976)	(7,719)	(30,311)
(Issuances) repayments of joint venture advances, net	(149,921)	22,378	442
Distributions of proceeds from sale and refinancing of joint venture interests	18,120	21,911	24,339
Return of investments in joint ventures	11,955	9,466	22,094
Issuance of notes receivable	(10,239)	(10,000)	(62,958)
Repayment of notes receivable	1,080	33,208	0
Decrease in restricted cash - capital improvements	10,224	5,082	86,173
Net cash flow (used for) provided by investing activities	(588,430)	200,696	31,762
Cash flow from financing activities:
Proceeds from (repayments of) revolving credit facilities, net	5,511	(138,098)	(492,224)
Proceeds from issuance of senior notes, net of underwriting commissions and offering expenses, of $1,345, $350 and $1,183 in 2012, 2011 and 2010, respectively	439,892	295,495	933,370
Repayment of senior notes	(445,682)	(207,858)	(541,606)
Proceeds from mortgages and other secured debt	718,506	186,956	23,686
Repayment of term loans and mortgage debt	(785,588)	(499,767)	(601,678)
Payment of debt issuance costs	(5,622)	(13,993)	(13,773)
Redemption of preferred shares	(170,000)	(180,000)	0
Proceeds from issuance of common shares, net of underwriting commissions and offering expenses, of $1,055, $835 and $998 in 2012, 2011 and 2010, respectively	492,129	129,684	440,430
Proceeds from issuance of common shares related to the exercise of warrants	0	59,978	0
Proceeds from issuance of preferred shares, net of underwriting commissions and offering expenses, of $845 in 2012	192,855	0	0
Repurchase of common shares in conjunction with equity award plans	(3,841)	(6,655)	(1,763)
Contributions from non-controlling interests	492	374	746
Distributions to non-controlling interests and redeemable operating partnership units	(9,128)	(2,250)	(2,886)
Dividends paid	(154,761)	(75,720)	(61,367)
Net cash provided by (used for) financing activities	274,763	(451,854)	(317,065)
Cash and cash equivalents
(Decrease) increase in cash and cash equivalents	(9,471)	22,037	(7,179)
Effect of exchange rate changes on cash and cash equivalents	(561)	(247)	423
Cash and cash equivalents, beginning of year	41,206	19,416	26,172
Cash and cash equivalents, end of year	$ 31,174	$ 41,206	$ 19,416