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Financial Instruments and Marketable Securities (Marketable Securities Treated As Available-For-Sale Securities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities, Amortized Cost $ 197 $ 197
Total available-for-sale securities, Gross Unrealized Gains 254 157
Total available-for-sale securities, Gross Unrealized Losses 0 0
Total available-for-sale securities, Fair Value 451 354
Common Stock
    
Schedule of Available-for-sale Securities [Line Items]    
Total available-for-sale securities, Amortized Cost 197 197
Total available-for-sale securities, Gross Unrealized Gains 254 157
Total available-for-sale securities, Gross Unrealized Losses 0 0
Total available-for-sale securities, Fair Value $ 451 $ 354