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Fair Value Measurements (Details Textual) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014
Fair value measurements (Textual) |  |  |
Marketable securities | $ 24,251 |  | $ 90,235
Total impairment charges related to adjustments to property carrying values | 21,900 | $ 100,000 |
Impairment charges before noncontrolling interests and income taxes, is included in discontinued operations | 100 | 74,200 |
Impairment charge on adjustment to property carrying value | 17,100 | 97,800 |
Impairment of marketable debt securities | 800 |  |
Impairment Related To Cost Method Investment |  | $ 2,200 |
Impairment of other real estate | 4,000 |  |
Level 1 [Member] |  |  |
Fair value measurements (Textual) |  |  |
Marketable securities | 22,500 |  | 87,700
Level 3 [Member] |  |  |
Fair value measurements (Textual) |  |  |
Marketable securities | $ 1,800 |  | $ 2,300

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