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Real estate (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Real Estate [Abstract]      
Revenues $ 5,561 $ 16,512 $ 88,536
Total expenses (2,450) (14,683) (62,143)
Impairment of assets (22,576) (9,147) (9,572)
Income (loss) from discontinued operations $ (19,465) $ (7,318) $ 16,821