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PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Prepaid and Other Current Assets [Abstract]    
Prepaid supplies $ 25,177 $ 26,804
Assets Held-for-sale, Not Part of Disposal Group, Current 8,843 2,522
Prepaid Expense 8,320 5,660
Prepaid Taxes 7,360 5,469
Prepaid royalty 6,973 5,863
Value Added Tax Receivable, Current 6,258 5,099
Prepaid Insurance 3,124 3,570
Deposits Assets, Current 2,640 842
Contract Receivable 1,430 0
Derivative Asset, Current 988 66
Other Receivables 899 3,166
Other 7,722 3,572
Prepaid and other current assets $ 79,734 $ 62,633