DEBT (Schedule of Long Term Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total debt	$ 1,033,406
Less: Deferred financing costs	(3,137)
Long-term debt, net of deferred financing costs	1,030,269	$ 1,030,205
Term Credit Agreement borrowings due 2024 at a variable interest rate of 2.9% at September 30, 2017
Debt Instrument [Line Items]
Total debt	$ 350,000
Debt instrument, interest rate during period	3.30%
Periodic effective interest rate	2.90%
Term Credit Agreement borrowings due 2024 at a variable interest rate of 2.9% at September 30, 2017 | LIBOR
Debt Instrument [Line Items]
Basis points on periodic interest rate	1.625%
Senior Notes due 2022 at a fixed interest rate of 3.75%
Debt Instrument [Line Items]
Total debt	$ 325,000
Fixed interest rate	3.75%
Incremental Term Loan Agreement borrowings due 2026 at a variable interest rate of 3.1% at September 30, 2017
Debt Instrument [Line Items]
Total debt	$ 300,000
Debt instrument, interest rate during period	2.80%
Periodic effective interest rate	3.10%
Incremental Term Loan Agreement borrowings due 2026 at a variable interest rate of 3.1% at September 30, 2017 | LIBOR
Debt Instrument [Line Items]
Basis points on periodic interest rate	1.90%
Revolving Credit Facility borrowings due 2020 at an average variable interest rate of 2.5% at September 30, 2017
Debt Instrument [Line Items]
Total debt	$ 50,000
Periodic effective interest rate	2.50%
New Zealand JV noncontrolling interest shareholder loan at 0% interest rate
Debt Instrument [Line Items]
Total debt	$ 8,406
Fixed interest rate	0.00%