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Real Estate Investments (Details 6) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Real Estate Properties [Line Items]      
Impairment of Real Estate $ 0 $ 0 $ 3,020
Continuing Operations [Member]      
Real Estate Properties [Line Items]      
Impairment of Real Estate 0 0 3,020
Discontinued Operations [Member]      
Real Estate Properties [Line Items]      
Impairment of Real Estate $ 0 $ 0 $ 0