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Fair Value Measurements (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair Value on Recurring Basis [Member] | Level 1 inputs [Member]
   
Fair Value Measurements (Textual) [Abstract]    
Fair value of marketable securities $ 592,000 $ 600,000
Fair value of debt security investments 0 3,500,000
Cash equivalents 0 5,000,000
Variable Interest Rate [Member] | Level 2 inputs [Member]
   
Fair Value Measurements (Textual) [Abstract]    
Fair value of long term variable interest debt $ 1,700,000 $ 0