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Other Assets (Available-for-sale Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Other Assets [Abstract]  
Available-for-sale equity securities, Cost $ 28,265
Available-for-sale equity securities, Gross Unrealized Gains 1,981
Available-for-sale equity securities, Gross Unrealized Losses (133) [1]
Available-for-sale equity securities, Fair Value $ 30,113
[1] All unrealized loss positions were held at a loss for less than 12 months.