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Note 21 - Income Taxes - GAAP Net Income/(Loss) to Taxable Income Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
GAAP net income (loss) |  | $ 88,161 | $ 100,158 | $ 165,386 | $ 144,090 | $ 84,896 | $ 121,030 | $ 143,416 | $ 76,733 | $ 497,795 | $ 426,075 | $ 378,850
Net book depreciation in excess of tax depreciation |  |  |  |  |  |  |  |  |  | 61,363 | 122,043 | 65,194
Capitalized leasing/legal commissions |  |  |  |  |  |  |  |  |  | (15,268) | (7,102) | (11,984)
Deferred/prepaid/above-market and below-market rents, net |  |  |  |  |  |  |  |  |  | (23,437) | (29,364) | (34,097)
Fair market value debt amortization |  |  |  |  |  |  |  |  |  | (5,268) | (8,495) | (15,901)
Book/tax differences from executive compensation (2) | [1] |  |  |  |  |  |  |  |  | 5,460 | 2,396 |
Book/tax differences from investments in and advances to real estate joint ventures |  |  |  |  |  |  |  |  |  | 7,921 | (23,802) | (20,739)
Book/tax differences from sale of properties |  |  |  |  |  |  |  |  |  | (2,889) | (86,629) | (93,704)
Book adjustment to property carrying values and marketable equity securities |  |  |  |  |  |  |  |  |  | 69,804 | 51,309 | 11,161
Taxable currency exchange gains/(losses), net |  |  |  |  |  |  |  |  |  | 1,260 | (780) | (8,962)
Tangible property regulation deduction |  |  |  |  |  |  |  |  |  | (49,209) | (52,809) | (28,954)
GAAP gain on change in control of joint venture interests |  |  |  |  |  |  |  |  |  | (6,800) | (71,160) | (57,385)
Valuation allowance against net deferred tax assets |  |  |  |  |  |  |  |  |  |  |  | 51,939
Other book/tax differences, net |  |  |  |  |  |  |  |  |  | (10,351) | 3,282 | 28
Adjusted REIT taxable income |  |  |  |  |  |  |  |  |  | 526,912 | 311,195 | 236,853
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Sharebased Compensation |  |  |  |  |  |  |  |  |  | (112) | (172) | (11,301)
GAAP Net Loss/(Income) of Taxable REIT Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
GAAP net income (loss) |  |  |  |  |  |  |  |  |  | (3,357) | (13,597) | 12,708
GAAP Net Income From REIT Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
GAAP net income (loss) | [2] |  |  |  |  |  |  |  |  | $ 494,438 | $ 412,478 | $ 391,558
[1] | In accordance with the Tax Cuts and Jobs Act, effective for tax years beginning on January 1, 2018, under Section 162(m) of the Code placed a $1.0 million limit on the amount a company can deduct for executive compensation for their CEO, CFO and 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.

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