CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Real estate, at cost:
Real estate, at cost	$ 3,812,294		$ 3,564,466
Real estate - intangible assets	762,157		685,914
Investments in real estate under construction	74,350		65,122
Real estate, gross	4,648,801		4,315,502
Less: accumulated depreciation and amortization	1,223,381	[1]	1,150,417	[1]
Real estate, net	3,425,420		3,165,085
Cash and cash equivalents	77,261		34,024
Restricted cash	19,953		26,741
Investment in and advances to non-consolidated entities	18,442		27,129
Deferred expenses (net of accumulated amortization of $28,587 in 2013 and $24,402 in 2012)	66,827		57,549
Loans receivable, net	99,443		72,540
Rent receivable - current	10,087		7,355
Rent receivable – deferred	19,473		0
Other assets	35,375		27,780
Total assets	3,772,281		3,418,203
Liabilities:
Mortgages and notes payable	1,197,489		1,415,961
Credit facility borrowings	48,000		0
Term loans payable	406,000		255,000
Senior notes payable	247,707		0
Convertible notes payable	27,491		78,127
Trust preferred securities	129,120		129,120
Dividends payable	40,018		31,351
Accounts payable and other liabilities	39,642		70,367
Accrued interest payable	9,627		11,980
Deferred revenue - including below market leases (net of accumulated accretion of $40,740 in 2013 and $44,706 in 2012)	69,667		79,908
Prepaid rent	18,037		13,224
Total liabilities	2,232,798		2,085,038
Commitments and contingencies
Equity:
Common shares, par value $0.0001 per share; authorized 400,000,000 shares, 228,663,022 and 178,616,664 shares issued and outstanding in 2013 and 2012, respectively	23		18
Additional paid-in-capital	2,717,787		2,212,949
Accumulated distributions in excess of net income	(1,300,527)		(1,143,803)
Accumulated other comprehensive income (loss)	4,439		(6,224)
Total shareholders’ equity	1,515,738		1,306,730
Noncontrolling interests	23,745		26,435
Total equity	1,539,483		1,333,165
Total liabilities and equity	3,772,281		3,418,203
Series C [Member] | Convertible Preferred Stock [Member]
Equity:
Preferred shares, value	94,016		94,016
Series D [Member] | Cumulative Redeemable [Member]
Equity:
Preferred shares, value	$ 0		$ 149,774

[1] Includes accumulated amortization of real estate intangible assets of $447,764 and $412,349 in 2013 and 2012, respectively. The estimated amortization of the above real estate intangible assets for the next five years is $44,003 in 2014, $34,932 in 2015, $28,640 in 2016, $25,239 in 2017 and $21,498 in 2018.