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Note 6 - Impairments - Asset Impairment Charges (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Impairment charges included in operating expenses |  | $ 67,331 | $ 93,266 | $ 45,383
Real estate |  |  |  | 100
Impairment charges |  | 67,331 | 93,266 | 45,464
Noncontrolling interests |  |  | (400) | (5,600)
Income tax benefit |  |  | (21,100) | (9,000)
Impairment charges, net |  | 67,300 | 71,800 | 30,900
Property Carrying Values [Member] |  |  |  |
Impairment charges included in operating expenses | [1],[2],[3],[4] | 67,300 | 93,300 | 30,300
Noncontrolling interests |  |  | (400) | (5,600)
Income tax benefit |  |  | (21,100) | (5,400)
Other Real Estate Investments [Member] |  |  |  |
Impairment charges included in operating expenses | [5] |  |  | 5,300
Marketable Securities and Other Investments [Member] |  |  |  |
Impairment charges included in operating expenses | [6] |  |  | $ 9,800
[1] | During 2015, the Company recognized aggregate impairment charges of $30.3 million, before an income tax benefit of $5.4 million and noncontrolling interests of $5.6 million.
[2] | During 2016, the Company recognized aggregate impairment charges of $93.3 million, before an income tax benefit of $21.1 million and noncontrolling interests of $0.4 million, primarily related to sale of certain operating properties, certain properties maintained in the Company's TRS for which the hold period was re-evaluated in connection with the Merger (see Footnote 21 of the Notes to Consolidated Financial Statements for additional disclosure) and adjustments to property carrying values in connection with the Company's efforts to market certain properties and management's assessment as to the likelihood and timing of such potential transactions and the anticipated hold period for such properties.
[3] | During 2017, the Company recognized aggregate impairment charges of $67.3 million. These impairment charges consist of (i) $34.0 million related to adjustments to property carrying values for properties which the Company has marketed for sale as part of its active capital recycling program and as such has adjusted the anticipated hold periods for such properties, (ii) $17.1 million related to the sale of certain operating properties (as discussed in Footnote 5 of the Notes to Consolidated Financial Statements) and (iii) $16.2 million related to a property for which the Company has re-evaluated its long-term plan for the property due to unfavorable local market conditions.
[4] | See Footnote 15 of the Notes to Consolidated Financial Statements for additional disclosure on fair value
[5] | Impairment charges primarily based upon review of residual values, sales prices and debt maturity status and the likelihood of foreclosure of certain underlying properties within the Company's preferred equity investments during 2015. The Company believed it would not recover its investment in certain preferred equity investments and as such recorded full impairments on these investments.
[6] | During 2015, the Company reviewed the underlying cause of the decline in value of certain cost method investments, as well as the severity and the duration of the decline and determined that the decline was other-than-temporary. Impairment charges were recognized based upon the calculation of the investments' estimated fair value.

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