PREPAID AND OTHER CURRENT ASSETS (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Prepaid and Other Current Assets [Abstract]
Prepaid supplies	$ 26,804	$ 28,477
Prepaid royalty	5,863	5,940
Prepaid Taxes	5,469	19,474
Value Added Tax Receivable, Current	5,099	6,294
Prepaid Insurance	3,570	2,580
Other Receivables	3,166	3,717
Assets Held-for-sale, Not Part of Disposal Group, Current	2,522	0
Deposits Assets, Current	842	1,700
Derivative Asset, Current	66	1,068
Other	9,232	10,984
Prepaid and other current assets	$ 62,633	$ 80,234