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Real estate (Details 4) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Real Estate [Abstract]    
Revenues $ 1,938 $ 4,903
Total expenses (1,009) (2,989)
Impairment of assets 32 (15,275)
Income (loss) from discontinued operations $ 961 $ (13,361)