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Other Long-Term Liabilities (Details) (USD $)
In Millions
6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Other Long-Term Liabilities    
Lease terms five to ten years  
Deferred lease incentives $ 2.9 $ 3.2
Deferred rent associated with lease obligations 9.0 7.9
Gain on sale and lease back of Loudoun, Virginia campus building, before tax 2.8  
Sale and lease back term, years 10  
Non-current portion of sale lease back gain $ 1.4 $ 1.5