FAIR VALUE MEASUREMENTS - Carrying Amount and Estimated Fair Value of Financial Instruments (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	$ (64,633,000)	$ (11,904,000)
Carrying Amount	0	10,582,000
Excluding Timber Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current maturities of long-term debt, excluding Timber Funds	0	(82,000,000)
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	2,975,000	1,233,000
Carrying Amount	0	10,582,000
Noncontrolling Interests in the Operating Partnership	(130,121,000)	0
Carrying Amount | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, liabilities	(51,580,000)	(8,454,000)
Carrying Amount | Forward-starting interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, liabilities	(12,529,000)	0
Carrying Amount | Realized (gain) loss on foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	6,018,000	642,000
Carrying Amount | Foreign currency option contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	1,515,000	303,000
Carrying Amount | Carbon options contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	(607,000)
Carrying Amount | Excluding Timber Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, excluding Timber Funds	80,454,000	68,735,000
Current maturities of long-term debt, excluding Timber Funds	0	(82,000,000)
Long-term debt	(1,300,336,000)	(973,129,000)
Carrying Amount | Timber Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, excluding Timber Funds	4,053,000	0
Long-term debt	(60,179,000)	0
Fair Value | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	2,975,000	1,233,000
Carrying Amount	0	10,582,000
Noncontrolling Interests in the Operating Partnership	(130,121,000)	0
Fair Value | Level 1 | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, liabilities	0	0
Fair Value | Level 1 | Forward-starting interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, liabilities	0	0
Fair Value | Level 1 | Realized (gain) loss on foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	0	0
Fair Value | Level 1 | Foreign currency option contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	0	0
Fair Value | Level 1 | Carbon options contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Fair Value | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	0	0
Carrying Amount	0	0
Noncontrolling Interests in the Operating Partnership	0	0
Fair Value | Level 2 | Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, liabilities	(51,580,000)	(8,454,000)
Fair Value | Level 2 | Forward-starting interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swaps, liabilities	(12,529,000)	0
Fair Value | Level 2 | Realized (gain) loss on foreign currency exchange contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	6,018,000	642,000
Fair Value | Level 2 | Foreign currency option contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency contracts	1,515,000	303,000
Fair Value | Level 2 | Carbon options contracts
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	(607,000)
Fair Value | Excluding Timber Funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, excluding Timber Funds	80,454,000	68,735,000
Current maturities of long-term debt, excluding Timber Funds	0	0
Long-term debt	0	0
Fair Value | Excluding Timber Funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, excluding Timber Funds	0	0
Current maturities of long-term debt, excluding Timber Funds	0	(82,000,000)
Long-term debt	(1,313,631,000)	(981,500,000)
Fair Value | Timber Funds | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, excluding Timber Funds	4,053,000	0
Long-term debt	0	0
Fair Value | Timber Funds | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents, excluding Timber Funds	0	0
Long-term debt	$ (60,474,000)	$ 0