Note 22 - Income Taxes - GAAP Net Income to Taxable Income Reconciliation (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net income		$ 201,234	$ (38,394)	$ 747,893	$ 90,100	$ 109,419	$ 83,990	$ 101,027	$ 116,169	$ 1,000,833	$ 410,605	$ 497,795
Net book depreciation in excess of tax depreciation										(61,272)	55,903	46,754
Capitalized leasing/legal commissions										0	0	(15,268)
Deferred/prepaid/above-market and below-market rents, net										(16,891)	(33,287)	(23,466)
Fair market value debt amortization										(3,847)	(4,510)	(5,268)
Book/tax differences from executive compensation (2)	[1]									10,388	6,026	5,460
Book/tax differences from investments in and advances to real estate joint ventures										45,782	4,837	22,263
Book/tax differences from sale of properties										(10,494)	(13,830)	(13,612)
Book/tax differences from accounts receivable										45,175	1,573	1,636
Book adjustment to property carrying values and marketable equity securities										(588,777)	37,709	59,866
Taxable currency exchange (loss)/gain, net										(29)	(33)	929
Tangible property regulation deduction										(50,597)	0	(40,361)
GAAP gain on change in control of joint venture interests										0	(137)	(6,800)
Dividends from TRSs										2	3,331	526
Severance accrual										6,425	(475)	913
Other book/tax differences, net										(1,097)	(3,946)	(1,774)
Adjusted REIT taxable income										374,410	463,764	527,045
Share-based Payment Arrangement, Option [Member]
Sharebased Compensation										(231)	(1,121)	(112)
GAAP Net Loss/(Income) of Taxable REIT Subsidiaries [Member]
Net income										(960)	1,119	(2,436)
GAAP Net Income From REIT Operations [Member]
Net income	[2]									$ 999,873	$ 411,724	$ 495,359

[1] In accordance with the Tax Cuts and Jobs Act, effective for tax years beginning on January 1, 2018, Section 162(m) of the Code a $1.0 million limit per executive was placed on the amount a company can deduct for executive compensation for each of their CEO, CFO and the other three most highly paid executives.

[2] All adjustments to "GAAP net income from REIT operations" are net of amounts attributable to noncontrolling interests and TRSs.