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Operating Units Other Segments (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Real Estate Segment [Member]
real_estate_properties
Dec. 31, 2012
Real Estate Segment [Member]
Jun. 30, 2013
ARI [Member]
Jun. 30, 2013
Viskase [Member]
manufacturing_facilities
distribution_centers
Jun. 30, 2013
MASSACHUSETTS
Real Estate Segment [Member]
real_estate_property_units
Jun. 30, 2013
FLORIDA
Real Estate Segment [Member]
real_estate_property_units
Segment Reporting Information [Line Items]            
Percentage of equity ownership in subsidiary     55.60% 70.80%    
Nnumber of Manufacturing Facilities       8    
Number of Distribution Centers       10    
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage       71.00%    
Number of Real Estate commercial rental properties 29          
Number of units of residential housing in future development         295 870
Pledged assets $ 60 $ 73