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OTHER CURRENT ASSETS AND OTHER ASSETS - Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
OTHER CURRENT ASSETS AND OTHER ASSETS        
Non-trade receivables $ 8,130 $ 7,668    
Prepaid rent 4,410 4,248    
Prepaid maintenance 2,805 3,134    
Restricted cash 2,331 3,271 $ 2,231 $ 2,255
Prepaid insurance 1,124 271    
Prepaid benefits 901 368    
Other 1,714 1,928    
Total other current assets $ 21,415 $ 20,888