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PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
PREPAID AND OTHER CURRENT ASSETS    
Other assets $ 4,267 $ 6,358
Insurance 2,329 2,246
Other prepaids 1,971 1,104
Licensing, permits and tolls 2,636 2,772
Highway and fuel taxes 714 1,024
Total $ 11,917 $ 13,504