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TIMBERLAND ACQUISITIONS - Summary of Timberland Acquisitions (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 USD ($) a | Dec. 31, 2019 USD ($) a | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Cost | $ | $ 24,695 | $ 142,287 | $ 57,608
Acres | a | 15,012 | 70,919 |
Alabama |  |  |
Business Acquisition [Line Items] |  |  |
Cost | $ | $ 100 | $ 0 |
Acres | a | 56 | 0 |
Florida |  |  |
Business Acquisition [Line Items] |  |  |
Cost | $ | $ 0 | $ 71,183 |
Acres | a | 0 | 42,522 |
Georgia |  |  |
Business Acquisition [Line Items] |  |  |
Cost | $ | $ 18 | $ 13,395 |
Acres | a | 20 | 10,271 |
Louisiana |  |  |
Business Acquisition [Line Items] |  |  |
Cost | $ | $ 24,123 | $ 0 |
Acres | a | 12,558 | 0 |
Texas |  |  |
Business Acquisition [Line Items] |  |  |
Cost | $ | $ 0 | $ 14,349 |
Acres | a | 0 | 6,643 |
Washington |  |  |
Business Acquisition [Line Items] |  |  |
Cost | $ | $ 0 | $ 7,340 |
Acres | a | 0 | 2,260 |
New Zealand |  |  |
Business Acquisition [Line Items] |  |  |
Cost | $ | $ 454 | $ 36,020 |
Acres | a | 2,378 | 9,223 |

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- Definition The cash outflow for acquisition of timber and timberlands during the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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