Consolidated Statements of Operations and Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Revenues:
Rental and related revenue	$ 208,957	$ 184,581	$ 616,451	$ 554,752
General contractor and service fee revenue	93,932	127,708	226,507	409,617
Revenues, total	302,889	312,289	842,958	964,369
Expenses:
Rental expenses	39,659	35,105	111,477	108,224
Real estate taxes	28,676	26,355	85,255	79,866
General contractor and other services expenses	87,719	120,547	209,519	379,180
Depreciation and amortization	95,117	81,068	279,136	242,043
Costs and expenses, total	251,171	263,075	685,387	809,313
Other operating activities:
Equity in earnings of unconsolidated companies	2,280	3,104	4,056	5,890
Gain on sale of properties	403	(1,437)	245	66,910
Undeveloped land carrying costs	(2,140)	(2,259)	(6,606)	(7,021)
Other operating expenses	(130)	(60)	(591)	(171)
General and administrative expenses	(8,934)	(9,493)	(32,367)	(29,231)
Other operation transactions, total	(8,521)	(10,145)	(35,263)	36,377
Operating income	43,197	39,069	122,308	191,433
Other income (expenses):
Interest and other income, net	150	172	394	543
Interest expense	(61,539)	(54,528)	(183,623)	(161,765)
Acquisition-related activity	(954)	(342)	(2,563)	(1,525)
Income (loss) from continuing operations before income taxes	(19,146)	(15,629)	(63,484)	28,686
Income tax benefit	103	194	103	194
Income (loss) from continuing operations	(19,043)	(15,435)	(63,381)	28,880
Discontinued operations:
Income (loss) before gain on sales	(114)	(1,522)	(1,185)	(9,223)
Gain on sale of depreciable properties	1,608	2,088	11,179	16,405
Income (loss) from discontinued operations	1,494	566	9,994	7,182
Net income (loss)	(17,549)	(14,869)	(53,387)	36,062
Dividends on preferred shares/units	(11,081)	(14,399)	(35,356)	(46,347)
Adjustments for redemption/repurchase of preferred shares/units	0	(3,633)	(5,730)	(3,796)
Net (income) loss attributable to noncontrolling interests - consolidated entities not wholly owned by the Partnership	(59)	(43)	(365)	163
Net (income) loss attributable to noncontrolling interests	400	825	1,371	532
Net income (loss) attributable to common shareholders/unitholders	(28,230)	(32,076)	(93,102)	(13,549)
Basic net income (loss) per common share/unit:
Continuing operations attributable to common shareholders/unitholders	$ (0.11)	$ (0.13)	$ (0.40)	$ (0.09)
Discontinued operations attributable to common shareholders/unitholders	$ 0.00	$ 0.00	$ 0.04	$ 0.03
Total	$ (0.11)	$ (0.13)	$ (0.36)	$ (0.06)
Diluted net income (loss) per common share/unit:
Continuing operations attributable to common shareholders/unitholders	$ (0.11)	$ (0.13)	$ (0.40)	$ (0.09)
Discontinued operations attributable to common shareholders/unitholders	$ 0.00	$ 0.00	$ 0.04	$ 0.03
Total	$ (0.11)	$ (0.13)	$ (0.36)	$ (0.06)
Weighted average number of common shares/units outstanding	270,289	252,802	265,153	252,618
Weighted average number of common shares/units and potential dilutive securities	270,289	252,802	265,153	252,618
Comprehensive income (loss):
Net income (loss)	(17,549)	(14,869)	(53,387)	36,062
Other comprehensive income:
Derivative instrument activity	410	437	1,190	1,925
Other comprehensive income	410	437	1,190	1,925
Comprehensive income (loss)	(17,139)	(14,432)	(52,197)	37,987
Subsidiary of Common Parent [Member]
Revenues:
Rental and related revenue	208,957	184,581	616,451	554,752
General contractor and service fee revenue	93,932	127,708	226,507	409,617
Revenues, total	302,889	312,289	842,958	964,369
Expenses:
Rental expenses	39,659	35,105	111,477	108,224
Real estate taxes	28,676	26,355	85,255	79,866
General contractor and other services expenses	87,719	120,547	209,519	379,180
Depreciation and amortization	95,117	81,068	279,136	242,043
Costs and expenses, total	251,171	263,075	685,387	809,313
Other operating activities:
Equity in earnings of unconsolidated companies	2,280	3,104	4,056	5,890
Gain on sale of properties	403	(1,437)	245	66,910
Undeveloped land carrying costs	(2,140)	(2,259)	(6,606)	(7,021)
Other operating expenses	(130)	(60)	(591)	(171)
General and administrative expenses	(8,934)	(9,493)	(32,367)	(29,231)
Other operation transactions, total	(8,521)	(10,145)	(35,263)	36,377
Operating income	43,197	39,069	122,308	191,433
Other income (expenses):
Interest and other income, net	150	172	394	543
Interest expense	(61,539)	(54,528)	(183,623)	(161,765)
Acquisition-related activity	(954)	(342)	(2,563)	(1,525)
Income (loss) from continuing operations before income taxes	(19,146)	(15,629)	(63,484)	28,686
Income tax benefit	103	194	103	194
Income (loss) from continuing operations	(19,043)	(15,435)	(63,381)	28,880
Discontinued operations:
Income (loss) before gain on sales	(114)	(1,522)	(1,185)	(9,223)
Gain on sale of depreciable properties	1,608	2,088	11,179	16,405
Income (loss) from discontinued operations	1,494	566	9,994	7,182
Net income (loss)	(17,549)	(14,869)	(53,387)	36,062
Dividends on preferred shares/units	(11,081)	(14,399)	(35,356)	(46,347)
Adjustments for redemption/repurchase of preferred shares/units	0	(3,633)	(5,730)	(3,796)
Net (income) loss attributable to noncontrolling interests - consolidated entities not wholly owned by the Partnership	(59)	(43)	(365)	163
Net income (loss) attributable to common shareholders/unitholders	(28,689)	(32,944)	(94,838)	(13,918)
Basic net income (loss) per common share/unit:
Continuing operations attributable to common shareholders/unitholders	$ (0.11)	$ (0.13)	$ (0.40)	$ (0.09)
Discontinued operations attributable to common shareholders/unitholders	$ 0.00	$ 0.00	$ 0.04	$ 0.03
Total	$ (0.11)	$ (0.13)	$ (0.36)	$ (0.06)
Diluted net income (loss) per common share/unit:
Continuing operations attributable to common shareholders/unitholders	$ (0.11)	$ (0.13)	$ (0.40)	$ (0.09)
Discontinued operations attributable to common shareholders/unitholders	$ 0.00	$ 0.00	$ 0.04	$ 0.03
Total	$ (0.11)	$ (0.13)	$ (0.36)	$ (0.06)
Weighted average number of common shares/units outstanding	274,800	259,866	270,095	259,505
Weighted average number of common shares/units and potential dilutive securities	274,800	259,866	270,095	259,505
Comprehensive income (loss):
Net income (loss)	(17,549)	(14,869)	(53,387)	36,062
Other comprehensive income:
Derivative instrument activity	410	437	1,190	1,925
Other comprehensive income	410	437	1,190	1,925
Comprehensive income (loss)	$ (17,139)	$ (14,432)	$ (52,197)	$ 37,987