Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Real estate, accumulated depreciation		$ 3,128,182	$ 3,010,699
Total assets	[1]	18,543,581	18,459,199
Total liabilities	[2]	$ 8,314,939	$ 8,335,537
Preferred stock, par value (in dollars per share)		$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)		7,054,000	7,054,000
Preferred stock, shares issued (in shares)		19,580	19,580
Preferred stock, shares outstanding (in shares)		19,580	19,580
Preferred stock, liquidation preference		$ 489,500	$ 489,500
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized (in shares)		750,000,000	750,000,000
Common stock, shares issued (in shares)		618,002,532	616,658,593
Common stock, shares outstanding (in shares)		618,002,532	616,658,593
Variable Interest Entity, Primary Beneficiary [Member] | Nonrecourse [Member]
Total liabilities		$ 151,955	$ 153,924
Variable Interest Entity, Primary Beneficiary [Member] | Asset Pledged as Collateral [Member]
Total assets		$ 227,748	$ 227,858

[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2022 and December 31, 2021 of $227,748 and $227,858, respectively. See Footnote 11 of the Notes to Condensed Consolidated Financial Statements.

[2] Includes non-recourse liabilities of consolidated VIEs at March 31, 2022 and December 31, 2021 of $151,955 and $153,924, respectively. See Footnote 11 of the Notes to Condensed Consolidated Financial Statements.