VARIABLE INTEREST ENTITIES - Summary of VIEs (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 84,507	$ 68,735
Accounts receivable, less allowance for doubtful accounts	49,082	27,127
Prepaid expenses	4,095	2,600
Other current assets	6,765	867
Total current assets	170,565	125,975
Timber and timberlands, net of depletion and amortization	3,262,126	2,482,047
TOTAL ASSETS	3,728,733	2,860,996
Liabilities and Equity:
Accounts payable	24,790	18,160
Accrued taxes	7,347	3,032
Accrued interest	6,325	5,205
Deferred revenue	11,112	11,440
Other current liabilities	29,234	22,480
Total current liabilities	91,135	151,186
Long-term debt, net of deferred financing costs	1,360,515	973,129
Funds’ equity	1,474,057	1,439,981
TOTAL LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY	3,728,733	$ 2,860,996
Variable Interest Entity, Primary Beneficiary | ORM Timber Funds
ASSETS
Cash and cash equivalents	4,053
Accounts receivable, less allowance for doubtful accounts	3,620
Prepaid expenses	132
Other current assets	41
Total current assets	7,846
Timber and timberlands, net of depletion and amortization	410,884
TOTAL ASSETS	418,730
Liabilities and Equity:
Accounts payable	939
Intercompany payable	1,319
Accrued taxes	314
Accrued interest	513
Deferred revenue	323
Other current liabilities	732
Total current liabilities	4,140
Long-term debt, net of deferred financing costs	60,179
Funds’ equity	354,411
TOTAL LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY	418,730
Variable Interest Entity, Primary Beneficiary | Ferncliff Investors
ASSETS
Cash and cash equivalents	4,503
Intercompany receivable	111
Total current assets	4,614
Investment in real estate joint venture entity	2,112
Advances to real estate joint venture entity	1,000
TOTAL ASSETS	7,726
Liabilities and Equity:
Other accrued and deferred liabilities	3,447
Total current liabilities	3,447
Funds’ equity	4,279
TOTAL LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY	$ 7,726