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OTHER CURRENT ASSETS AND OTHER ASSETS - Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
OTHER CURRENT ASSETS AND OTHER ASSETS      
Non-trade receivables $ 8,561   $ 7,848
Prepaid rent 657   4,442
Prepaid maintenance 3,554   3,330
Prepaid insurance 1,723   258
Prepaid other 994   1,101
Prepaid purchase orders 934   998
Prepaid education and training 518   597
Prepaid benefits 117   157
Total other current assets $ 17,058 $ 14,744 $ 18,731