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Investments (Tables)
12 Months Ended
Dec. 31, 2011
Investments [Abstract]  
Investments in Marketable Equity Securities [Table Text Block]
       
(in thousands) 2011 2010
Total cost $ 169,271 $ 223,064
Net unrealized gains   133,930   117,846
Total fair value $ 303,201 $ 340,910