PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Prepaid insurance	$ 13,446	$ 7,609
Margin deposits	8,184	43,912
Unbilled revenue	9,003	1,615
Prepaid taxes	5,212	7,357
Vendor prepayments	767	1,863
Other	3,941	4,180
Total prepaid and other current assets	$ 40,553	$ 66,536