DEBT - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Sep. 01, 2020	Aug. 31, 2020	May 07, 2020	Apr. 30, 2020	Apr. 01, 2020	Dec. 31, 2019	Apr. 30, 2016	Mar. 31, 2012
Debt Instrument [Line Items]
Long-term debt, net of deferred financing costs	$ 1,360,515						$ 973,129
Excluding Timber Funds
Debt Instrument [Line Items]
Debt, carrying amount	1,302,820						1,057,000
Current maturities of long-term debt, excluding Timber Funds	0						82,000
Less: Deferred financing costs, excluding Timber Funds	(2,484)						(1,871)
Long-term debt, net of deferred financing costs	1,300,336						973,129
Timber Funds
Debt Instrument [Line Items]
Debt, carrying amount	60,189						0
Less: Deferred financing costs, excluding Timber Funds	(10)						0
Long-term debt, net of deferred financing costs	$ 60,179						0
Term Credit Agreement borrowings due 2028 at a variable interest rate of 1.8% at December 31, 2020 | Excluding Timber Funds
Debt Instrument [Line Items]
Effective interest rate	1.80%
Debt, carrying amount	$ 350,000						350,000
Less: Deferred financing costs, excluding Timber Funds						$ (500)
Senior Notes due 2022 at a fixed interest rate of 3.75%
Debt Instrument [Line Items]
Stated fixed interest rate				3.75%					3.75%
Senior Notes due 2022 at a fixed interest rate of 3.75% | Excluding Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	3.75%
Debt, carrying amount	$ 325,000						325,000
Incremental Term Loan Agreement borrowings due 2026 at a variable interest rate of 2.1% at December 31, 2020
Debt Instrument [Line Items]
Effective interest rate	2.80%
Debt, carrying amount								$ 300,000
Incremental Term Loan Agreement borrowings due 2026 at a variable interest rate of 2.1% at December 31, 2020 | Excluding Timber Funds
Debt Instrument [Line Items]
Effective interest rate	2.10%
Debt, carrying amount	$ 300,000						300,000
2020 Incremental Term Loan Facility borrowings due 2025 at a variable interest rate of 2.0% at December 31, 2020
Debt Instrument [Line Items]
Effective interest rate	2.30%
Debt, carrying amount					$ 250,000
Less: Deferred financing costs, excluding Timber Funds					$ (800)
2020 Incremental Term Loan Facility borrowings due 2025 at a variable interest rate of 2.0% at December 31, 2020 | Excluding Timber Funds
Debt Instrument [Line Items]
Effective interest rate	2.00%
Debt, carrying amount	$ 250,000						0
Revolving Credit Facility borrowings due 2025 at an average variable interest rate of 1.7% at December 31, 2020 | Excluding Timber Funds
Debt Instrument [Line Items]
Effective interest rate	1.70%
Debt, carrying amount	$ 0						82,000
New Zealand subsidiary noncontrolling interest shareholder loan due 2025 at a fixed interest rate of 2.95% | Excluding Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	2.95%
Debt, carrying amount	$ 24,903						0
Due 2025 at a fixed interest rate of 6.1% | Excluding Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	6.10%
Debt, carrying amount	$ 11,601						0
Due 2028 at a fixed interest rate of 4.1% | Excluding Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	4.10%
Debt, carrying amount	$ 12,018						0
Due 2033 at a fixed interest rate of 5.3% | Excluding Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	5.30%
Debt, carrying amount	$ 19,430						0
Due 2036 at a fixed interest rate of 5.4% | Excluding Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	5.40%
Debt, carrying amount	$ 9,868						0
Due 2022 at a fixed interest rate of 2.0% | Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	2.00%		4.90%
Debt, carrying amount	$ 11,000	$ 11,000					0
Due 2022 at a fixed interest rate of 2.0% | Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	2.00%	2.00%	3.80%
Debt, carrying amount	$ 14,000	$ 14,000					0
Due 2023 at a fixed interest rate of 5.1% | Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	5.10%
Debt, carrying amount	$ 19,563						0
Due 2024 at a fixed interest rate of 4.5% | Timber Funds
Debt Instrument [Line Items]
Stated fixed interest rate	4.50%
Debt, carrying amount	$ 15,626						$ 0