Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands		Jun. 30, 2022	Dec. 31, 2021
Real estate, accumulated depreciation		$ 3,238,079	$ 3,010,699
Total assets	[1]	18,197,569	18,459,199
Total liabilities	[2]	$ 8,212,562	$ 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)		19,435	19,580
Preferred stock, shares outstanding (in shares)		19,435	19,580
Preferred stock, liquidation preference		$ 485,868	$ 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)		618,483,648	616,658,593
Common stock, shares outstanding (in shares)		618,483,648	616,658,593
Variable Interest Entity, Primary Beneficiary [Member] | Nonrecourse [Member]
Total liabilities		$ 148,100	$ 153,900
Variable Interest Entity, Primary Beneficiary [Member] | Asset Pledged as Collateral [Member]
Total assets		$ 201,600	$ 227,900

[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at June 30, 2022 and December 31, 2021 of $201,644 and $227,858, respectively. See Footnote 12 of the Notes to Condensed Consolidated Financial Statements.

[2] Includes non-recourse liabilities of consolidated VIEs at June 30, 2022 and December 31, 2021 of $148,130 and $153,924, respectively. See Footnote 12 of the Notes to Condensed Consolidated Financial Statements.