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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, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
GAAP net income (loss) |  | $ 84,566 | $ 121,030 | $ 143,416 | $ 76,733 | $ 78,273 | $ (43,545) | $ 203,409 | $ 140,713 | $ 426,075 | $ 378,850 | $ 894,115
Net book depreciation in excess of tax depreciation |  |  |  |  |  |  |  |  |  | 116,106 | 65,194 | 21,515
Capitalized leasing/legal commissions |  |  |  |  |  |  |  |  |  |  | (11,984) | (14,246)
Deferred/prepaid/above-market and below-market rents, net |  |  |  |  |  |  |  |  |  | (30,303) | (34,097) | (32,848)
Fair market value debt amortization |  |  |  |  |  |  |  |  |  | (8,495) | (15,901) | (19,723)
Book/tax differences from investments in and advances to real estate joint ventures |  |  |  |  |  |  |  |  |  | (15,196) | (20,739) | (294)
Book/tax difference on sale of properties |  |  |  |  |  |  |  |  |  | (85,856) | (93,704) | (64,270)
Foreign income tax from capital gains |  |  |  |  |  |  |  |  |  |  | 3,976 | 5,873
Cumulative foreign currency translation adjustment and deferred tax adjustment |  |  |  |  |  |  |  |  |  | (1,300) |  |
Book adjustment to property carrying values and marketable equity securities |  |  |  |  |  |  |  |  |  | 53,893 | 11,161 | 4,484
Taxable currency exchange gains/(losses), net |  |  |  |  |  |  |  |  |  | 221 | (8,962) | (47,297)
Tangible property regulation deduction (b) | [1] |  |  |  |  |  |  |  |  | (52,237) | (28,954) | (126,957)
GAAP gain on change in control of interests |  |  |  |  |  |  |  |  |  | (71,160) | (57,385) | (149,407)
Valuation allowance against net deferred tax assets |  |  |  |  |  |  |  |  |  |  | 51,939 |
Other book/tax differences, net |  |  |  |  |  |  |  |  |  | (6,893) | 542 | (2,971)
Adjusted REIT taxable income |  |  |  |  |  |  |  |  |  | 313,195 | 236,853 | 454,021
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |
Sharebased Compensation |  |  |  |  |  |  |  |  |  | 676 | (4,490) | (3,094)
Employee Stock Option [Member] |  |  |  |  |  |  |  |  |  |  |  |
Sharebased Compensation |  |  |  |  |  |  |  |  |  | (172) | (11,301) | (4,786)
GAAP Net Loss/(Income) of Taxable REIT Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |
GAAP net income (loss) |  |  |  |  |  |  |  |  |  | (12,164) | 12,708 | (6,073)
GAAP Net Income From REIT Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
GAAP net income (loss) | [2] |  |  |  |  |  |  |  |  | $ 413,911 | $ 391,558 | $ 888,042
[1] | In September 2013, the Internal Revenue Service released final Regulations governing when taxpayers must capitalize and depreciate costs for acquiring, maintaining, repairing and replacing tangible property and when taxpayers must deduct such costs as repairs. Pursuant to these Regulations the Company deducted certain expenditures that would previously have been capitalized for tax purposes. The Regulations also allowed the Company to make an election to immediately deduct certain amounts that were capitalized in previous years but qualify as repairs under the new Regulations. The Company made such election in 2015 and deducted approximately $85.9 million.
[2] | All adjustments to "GAAP net income from REIT operations" are net of amounts attributable to noncontrolling interest and TRSs.

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to the Tangible property regulations deduction. + References No definition available. + Details
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