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Description of Business and Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Direct operating costs $ 57,382 $ 50,176 $ 47,284
Total stock based compensation 977 815 256
Stock Option [Member]
      
Direct operating costs 109 72 13
selling and adminstrative expenses $ 868 $ 743 $ 243