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PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
PREPAID AND OTHER CURRENT ASSETS    
Assets held for sale $ 14,134 $ 9,907
Insurance 6,008 7,642
Other prepaids 6,797 2,948
Licensing, permits and tolls 4,970 4,096
Highway and fuel taxes 393 1,238
Other assets 2,131 2,409
Total $ 34,433 $ 28,240