CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014		Dec. 31, 2013
Real estate, at cost:
Real estate, at cost	$ 3,671,560,000		$ 3,812,294,000
Real estate - intangible assets	705,566,000		762,157,000
Investments in real estate under construction	106,238,000		74,350,000
Real estate, gross	4,483,364,000		4,648,801,000
Less: accumulated depreciation and amortization	1,196,114,000	[1]	1,223,381,000	[1]
Real estate, net	3,287,250,000		3,425,420,000
Assets held for sale	3,379,000		0
Cash and cash equivalents	191,077,000		77,261,000
Restricted cash	17,379,000		19,953,000
Investment in and advances to non-consolidated entities	19,402,000		18,442,000
Deferred expenses (net of accumulated amortization of $34,087 in 2014 and $28,587 in 2013)	65,860,000		66,827,000
Loans receivable, net	105,635,000		99,443,000
Rent receivable - current	6,311,000		10,087,000
Rent receivable – deferred	61,372,000		19,473,000
Other assets	20,229,000		35,375,000
Total assets	3,777,894,000		3,772,281,000
Liabilities:
Mortgages and notes payable	945,216,000		1,197,489,000
Credit facility borrowings	0		48,000,000
Term loans payable	505,000,000		406,000,000
Senior notes payable	497,675,000		247,707,000
Convertible notes payable	15,664,000		27,491,000
Trust preferred securities	129,120,000		129,120,000
Dividends payable	42,864,000		40,018,000
Liabilities held for sale	2,843,000		0
Accounts payable and other liabilities	37,740,000		39,642,000
Accrued interest payable	8,301,000		9,627,000
Deferred revenue - including below market leases (net of accumulated accretion of $35,239 in 2014 and $40,740 in 2013)	68,215,000		69,667,000
Prepaid rent	16,336,000		18,037,000
Total liabilities	2,268,974,000		2,232,798,000
Commitments and contingencies
Equity:
Common shares, par value $0.0001 per share; authorized 400,000,000 shares, 233,278,037 and 228,663,022 shares issued and outstanding in 2014 and 2013, respectively	23,000		23,000
Additional paid-in-capital	2,763,374,000		2,717,787,000
Accumulated distributions in excess of net income	(1,372,051,000)		(1,300,527,000)
Accumulated other comprehensive income	404,000		4,439,000
Total shareholders’ equity	1,485,766,000		1,515,738,000
Noncontrolling interests	23,154,000		23,745,000
Total equity	1,508,920,000		1,539,483,000
Total liabilities and equity	3,777,894,000		3,772,281,000
Series C [Member] | Convertible Preferred Stock [Member]
Equity:
Series C Cumulative Convertible Preferred, liquidation preference $96,770 and 1,935,400 shares issued and outstanding	$ 94,016,000		$ 94,016,000

[1] Includes accumulated amortization of real estate intangible assets of $400,628 and $447,764 in 2014 and 2013, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $35,894 in 2015, $30,221 in 2016, $26,905 in 2017, $23,179 in 2018 and $18,014 in 2019.