Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Assets:
Operating real estate, net of accumulated depreciation of $2,155,365 and $2,115,320, respectively		$ 9,156,544	$ 9,274,299
Investments and advances in real estate joint ventures		702,586	742,559
Real estate under development		189,811	179,190
Other real estate investments		217,272	215,836
Mortgages and other financing receivables		24,000	23,824
Cash and cash equivalents		222,000	189,534
Marketable securities	[1]	5,716	7,565
Accounts and notes receivable		174,005	175,252
Other assets		557,427	536,112
Total assets		11,249,361	11,344,171
Liabilities:
Notes payable	[2]	3,660,666	3,761,328
Mortgages payable	[3]	1,501,796	1,614,982
Declaration of dividends paid in succeeding period		116,631	115,182
Other liabilities		566,206	584,019
Total liabilities		5,845,299	6,075,511
Redeemable noncontrolling interests		86,705	86,709
Stockholders' equity:
Preferred stock, $1.00 par value, authorized 6,029,100 shares 32,000 shares issued and outstanding (in series) Aggregate liquidation preference $800,000		32	32
Common stock, $.01 par value, authorized 750,000,000 shares issued and outstanding 418,281,954 and 413,430,756 shares, respectively		4,183	4,134
Paid-in capital		5,721,011	5,608,881
Cumulative distributions in excess of net income		(550,103)	(572,335)
Accumulated other comprehensive income		7,496	5,588
Total stockholders' equity		5,182,619	5,046,300
Noncontrolling interests		134,738	135,651
Total equity		5,317,357	5,181,951
Total liabilities and equity		$ 11,249,361	$ 11,344,171

[1] As of March 31, 2016 and December 31, 2015, the Company determined that $4.1 million and $5.9 million, respectively, of the Marketable securities estimated fair value were classified within Level 1 of the fair value hierarchy and the remaining $1.7 million and $1.7 million, respectively, were classified within Level 3 of the fair value hierarchy.

[2] The Company determined that its valuation of Notes payable was classified within Level 2 of the fair value hierarchy.

[3] The Company determined that its valuation of Mortgages payable was classified within Level 3 of the fair value hierarchy.