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Other Long-Term Liabilities (Details Textual)
$ in Thousands
 1 Months Ended 3 Months Ended
Apr. 30, 2016
USD ($)
Jun. 30, 2007
USD ($)
Asset
Mar. 31, 2016
USD ($)
Sellers
Mar. 31, 2015
USD ($)
Jan. 13, 2016
USD ($)
Dec. 31, 2015
USD ($)
Other Long -Term Liabilities (Textual)            
Deferred payment arrangements, maximum amount     $ 18,000      
Deferred payment arrangements     14,600      
Deferred payment arrangements value     3,300     $ 3,300
Funds received from investor     $ 2,800      
Sale price of one of campus buildings   $ 5,800        
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   $ 2,800        
Sale and lease back term   10 years        
Number of assets sold | Asset   1        
Deferred payment arrangement number of sellers | Sellers     1      
Contingent consideration to sellers     $ 405 $ 300    
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      
NYCDA [Member]            
Other Long -Term Liabilities (Textual)            
Deferred payment arrangements         $ 14,500  
NYCDA [Member] | Subsequent Event [Member]            
Other Long -Term Liabilities (Textual)            
Contingent consideration to sellers $ 6,000