Condensed Consolidated Balance Sheets (Current Period Unaudited (Parentheticals) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Real estate, accumulated depreciation		$ 2,727,002	$ 2,717,114
Total assets	[1]	11,699,703	11,614,498
Total liabilities	[2]	$ 5,953,384	$ 5,928,460
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)		433,448,386	432,518,743
Common stock, shares outstanding (in shares)		433,448,386	432,518,743
Variable Interest Entity, Primary Beneficiary [Member] | Nonrecourse [Member]
Total liabilities		$ 96,700	$ 62,100
Variable Interest Entity, Primary Beneficiary [Member] | Asset Pledged as Collateral [Member]
Total assets		$ 101,900	$ 102,500

[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2021 and December 31, 2020 of $101,947 and $102,482, respectively. See Footnote 10 of the Notes to Condensed Consolidated Financial Statements.

[2] Includes non-recourse liabilities of consolidated VIEs at March 31, 2021 and December 31, 2020 of $96,660 and $62,076, respectively. See Footnote 10 of the Notes to Condensed Consolidated Financial Statements.