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Real estate (Details 4) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Real Estate [Abstract] |  |  |  |
Revenues | $ 872 | $ 3,037 | $ 2,810 | $ 7,939
Total expenses | (769) | (2,464) | (1,799) | (5,459)
Impairment of assets | (427) | (1,346) | (395) | (16,620)
Income (loss) from discontinued operations | $ (324) | $ (773) | $ 616 | $ (14,140)

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