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Other Long-Term Liabilities (Details Textual) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Other Long -Term Liabilities (Textual)  
Sale price of one of campus buildings $ 5.8
Sale and lease back term for most of the campus building over a 10-year period
Gain on sale and lease back of one of campus buildings before tax $ 2.8
Minimum [Member]
  
Other Long -Term Liabilities (Textual)  
Leasehold improvements and long-term liability amortization period 5 years
Maximum [Member]
  
Other Long -Term Liabilities (Textual)  
Leasehold improvements and long-term liability amortization period 10 years