VARIABLE INTEREST ENTITIES (Summary of VIEs) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS
Cash and cash equivalents	$ 94,786	$ 68,735
Accounts receivable	36,811	27,127
Prepaid expenses	18,133	14,728
Other current assets	1,135	867
Total current assets	161,230	125,975
TIMBER AND TIMBERLANDS, NET OF DEPLETION AND AMORTIZATION	3,332,067	2,482,047
TOTAL ASSETS	3,769,267	2,860,996
LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY
Accounts payable	21,836	18,160
Accrued taxes	6,444	3,032
Accrued interest	6,500	5,205
Deferred revenue	18,434	11,440
Other current liabilities	24,405	22,480
Total current liabilities	109,289	151,186
Long-term debt, net of deferred financing costs	1,346,123
Equity	1,457,241	1,439,981
TOTAL LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY	3,769,267	$ 2,860,996
Variable Interest Entity, Primary Beneficiary | Ferncliff Investors
ASSETS
Cash and cash equivalents	760
Total current assets	760
Investment in real estate joint venture entity	3,141
Advances to real estate joint venture entity	1,000
TOTAL ASSETS	4,901
LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY
Intercompany payable	10
Total current liabilities	10
Equity	4,891
TOTAL LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY	4,901
Variable Interest Entity, Primary Beneficiary | ORM Timber Funds
ASSETS
Cash and cash equivalents	6,973
Accounts receivable	3,213
Prepaid expenses	81
Other current assets	361
Total current assets	10,628
TIMBER AND TIMBERLANDS, NET OF DEPLETION AND AMORTIZATION	467,800
Other Assets	3
TOTAL ASSETS	478,431
LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY
Accounts payable	636
Intercompany payable	3,837
Current maturities of long-term debt, excluding Timber Funds (Note 7)	25,042
Accrued taxes	251
Accrued interest	655
Deferred revenue	1
Other current liabilities	787
Total current liabilities	31,209
Long-term debt, net of deferred financing costs	35,617
Equity	411,605
TOTAL LIABILITIES, NONCONTROLLING INTERESTS IN THE OPERATING PARTNERSHIP AND SHAREHOLDERS’ EQUITY	$ 478,431