DEBT (Schedule of Long Term Debt) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 1,056,183
Less: Current maturities of long-term debt	0
Less: Deferred financing costs	(3,876)
Long-term debt, net of deferred financing costs	1,052,307	$ 830,554
Senior Notes due 2022 at a fixed interest rate of 3.75%
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 325,000
Fixed interest rate	3.75%
Term Credit Agreement borrowings due 2024 at a variable interest rate of 2.1% at June 30, 2016
Debt Instrument [Line Items]
Variable interest rate	2.10%
Incremental Term Loan Agreement borrowings due 2026 at a variable interest rate of 2.4% at June 30, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 300,000
Variable interest rate	2.40%
Mortgage notes due 2017 at fixed interest rates of 4.35%
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 42,436
Fixed interest rate	4.35%
Solid waste bond due 2020 at a variable interest rate of 1.7% at June 30, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 15,000
Variable interest rate	1.70%
New Zealand JV noncontrolling interest shareholder loan at 0% interest rate
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 23,747
Fixed interest rate	0.00%
Term Loan Facility \| Term Credit Agreement borrowings due 2024 at a variable interest rate of 2.1% at June 30, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 350,000
Variable interest rate	3.30%

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 20
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 16
-Article 9

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

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Contractual interest rate for funds borrowed, under the debt agreement.

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For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28555-108399

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- Definition

Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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