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Stock Option and Restricted Stock Plans (Details 4) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock compensation expense:      
Total (in dollars) $ 5,677 $ 3,725 $ 2,236
Included in general and administrative
     
Stock compensation expense:      
Total (in dollars) 3,538 1,996 763
Included in cost of services
     
Stock compensation expense:      
Total (in dollars) $ 2,139 $ 1,729 $ 1,473