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Marketable Securities - Fair Value Hierarchy of Assets Measured on Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities $ 437 $ 354 $ 27,166
Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 437 354 27,166
Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 0 0 0
Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 0 0 0
Common stock [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 437 354 310
Common stock [Member] | Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 437 354 310
Common stock [Member] | Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 0 0 0
Common stock [Member] | Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities 0 0 0
Government and agency securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities     26,856
Government and agency securities [Member] | Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities     26,856
Government and agency securities [Member] | Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities     0
Government and agency securities [Member] | Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total available-for-sale securities     $ 0