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Other Assets (Available-For-Sale Investments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Other Assets [Abstract]    
Available-for-sale investments, Cost   $ 28,265
Available-for-sale Securities, Gross Unrealized Gains   1,981
Available-for-sale investments, Gross Unrealized Losses   (133) [1]
Available-for-sale investments $ 0 $ 30,113
[1] (1)All unrealized loss positions were held at a loss for less than 12 months.