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Marketable Securities - Summary of Marketable Securities Treated as Available-for-Sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities, Amortized cost $ 197 $ 197 $ 27,065
Total available-for-sale securities, Gross unrealized gains 244 157 163
Total available-for-sale securities, Gross unrealized losses 0 0 0
Total available-for-sale securities, Fair value 441 354 27,228
Common stock [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities, Amortized cost 197 197 197
Total available-for-sale securities, Gross unrealized gains 244 157 163
Total available-for-sale securities, Gross unrealized losses 0 0 0
Total available-for-sale securities, Fair value 441 354 360
Government and agency securities [Member]
      
Schedule of Available-for-sale Securities [Line Items]      
Total available-for-sale securities, Amortized cost     26,868
Total available-for-sale securities, Gross unrealized gains     0
Total available-for-sale securities, Gross unrealized losses     0
Total available-for-sale securities, Fair value     $ 26,868