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DEBT - SCHEDULE OF DEBT (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Aug. 27, 2009
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,360,000	$ 1,400,000
Long-term debt	1,362,271
Total debt	1,362,271	1,401,781
Debt Issuance Costs, Net	(13,711)	(16,508)
Less current and short-term portion	35,299	22,138
Total long-term debt	1,313,261	1,363,135
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term debt	84,237	143,980
Senior Notes [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	500,000
Long-term debt	500,000	500,000
Senior Notes due 2024 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	350,000
Long-term debt	$ 350,000	350,000
Accounts receivable securitization facility
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	1.90%
Long-term debt	$ 380,000	380,000
Revolving credit facility
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	3.00%
Long-term debt	$ 12,000	4,000
Foreign Line of Credit [Member]
Debt Instrument [Line Items]
Long-term debt	$ 34,075	20,920
Convertible Debt
Debt Instrument [Line Items]
Debt Instrument, Face Amount			$ 345,000
Debt Instrument, Interest Rate, Effective Percentage	13.875%
Capital leases
Debt Instrument [Line Items]
Long-term debt	$ 1,959	$ 2,881
United States | Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate	4.70%
Debt Instrument, Face Amount	$ 700,000
Debt Instrument, Interest Rate, Effective Percentage	1.00%

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- Definition

Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations.

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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