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PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($)
$ in Thousands
Dec. 31, 2014
Dec. 31, 2013
Prepaid and Other Current Assets [Abstract]    
Prepaid supplies $ 28,477 $ 30,212
Prepaid Taxes 19,474 48,527
Value Added Tax Receivable, Current 6,294 9,761
Prepaid royalty 5,940 5,642
Other Receivables 3,717 4,777
Prepaid Insurance 2,580 3,281
Deposits Assets, Current 1,700 3,748
Derivative Asset, Current 1,068 0
Other 10,984 8,398
Prepaid and other current assets $ 80,234 $ 114,346