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PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
PREPAID AND OTHER CURRENT ASSETS    
Other assets $ 7,757 $ 6,358
Insurance 2,133 2,246
Other prepaids 2,444 1,104
Licensing, permits and tolls 3,463 2,772
Highway and fuel taxes 395 1,024
Total $ 16,192 $ 13,504