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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Additional Disclosures (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Receivables, Net, Current [Abstract]
Trade	$ 524,712us-gaap_AccountsReceivableNetCurrent	$ 323,679us-gaap_AccountsReceivableNetCurrent
Income tax	6,315us-gaap_IncomeTaxesReceivable	6,759us-gaap_IncomeTaxesReceivable
Other	14,177us-gaap_OtherReceivablesNetCurrent	14,108us-gaap_OtherReceivablesNetCurrent
Total receivables - trade and other	$ 545,204	$ 344,546

Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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