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Asset Liquidation Investments and Other Investments (Details 2) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Net investment $ 2,602 $ 2,772
Polaroid [Member]
   
Capital invested 3,033  
Equity in earnings 227  
Capital returned (677)  
Net investment 2,583 2,753
Class A [Member] | Polaroid [Member]
   
Capital invested 2,427  
Equity in earnings 185  
Capital returned (544)  
Net investment 2,068  
Class D [Member] | Polaroid [Member]
   
Capital invested 606  
Equity in earnings 42  
Capital returned (133)  
Net investment $ 515