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Investments (Investments in Marketable Equity Securities) (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Investments [Abstract]    
Total cost $ 195,832 $ 169,271
Net unrealized gains 184,255 133,930
Total Fair Value $ 380,087 [1] $ 303,201 [1]
[1] The Company’s investments in marketable equity securities are classified as available-for-sale.