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Other Long-Term Liabilities (Details Textual)
$ in Millions
 1 Months Ended 6 Months Ended
Jun. 30, 2007
USD ($)
Asset
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
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 10 years    
Gain on sale and lease back of one of campus buildings before tax $ 2.8    
Funds received from investor   $ 2.8  
Sale and lease back term 10 years    
Number of assets sold | Asset 1    
Deferred payment arrangements value   $ 2.8 $ 2.4
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