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Significant Accounting Policies and Practices (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cost of Contracts      
Weighted average contract life (in years) 9 years 6 months 9 years 8 months 12 days 9 years 6 months
Amortization expense, cost of contracts $ 3,142 $ 2,275 $ 1,907
Goodwill      
Goodwill impairment recognized 0    
Growth rate for future periods (as a percent) 0.00%    
Discount rate (as a percent) 10.00%    
Debt Issuance Costs      
Debt issuance costs 5,149 950  
Amortization expense $ 1,211 $ 638 $ 638
Equipment | Minimum
     
Leasehold Improvements, Equipment and Construction in Progress, Net      
Ranges of Estimated useful life (in years) 2 years    
Equipment | Maximum
     
Leasehold Improvements, Equipment and Construction in Progress, Net      
Ranges of Estimated useful life (in years) 5 years    
Leasehold improvements | Maximum
     
Leasehold Improvements, Equipment and Construction in Progress, Net      
Ranges of Estimated useful life (in years) 10 years    
Leasehold improvements | Average
     
Leasehold Improvements, Equipment and Construction in Progress, Net      
Ranges of Estimated useful life (in years) 10 years