DEBT (Schedule of Long Term Debt) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 872,843
Less: Current maturities of long-term debt	(12,211)	$ 0
Less: Deferred financing costs	(3,203)
Long-term debt, net of deferred financing costs	857,429	$ 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 March 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 350,000
Variable interest rate	2.10%
Revolving Credit Facility borrowings due 2020 at a variable interest rate of 1.7% at March 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 105,000
Variable interest rate	1.70%
Mortgage notes due 2017 at fixed interest rates of 4.35%
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 42,537
Fixed interest rate	4.35%
Solid waste bond due 2020 at a variable interest rate of 1.7% at March 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 15,000
Variable interest rate	1.70%
New Zealand JV Working Capital Facility due 2016 at a variable interest rate of 3.2% at March 31, 2016
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 12,211
Variable interest rate	3.20%
New Zealand JV noncontrolling interest shareholder loan at 0% interest rate
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 23,095
Fixed interest rate	0.00%