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Timberland Acquisitions - Summary of Timberland Acquisitions (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2011 a | Dec. 31, 2017 USD ($) a | Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($)
Business Acquisition [Line Items] |  |  |  |
Cost | $ |  | $ 242,910 | $ 366,481 | $ 98,409
Acres | a | 250,000 | 109,533 | 110,727 |
Florida |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cost | $ |  | $ 32,334 | $ 14,323 |
Acres | a |  | 15,382 | 6,937 |
Georgia |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cost | $ |  | $ 147,833 | $ 12,485 |
Acres | a |  | 68,473 | 5,427 |
Oregon |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cost | $ |  | $ 0 | $ 239,896 |
Acres | a |  | 0 | 55,603 |
South Carolina |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cost | $ |  | $ 39,884 | $ 0 |
Acres | a |  | 17,651 | 0 |
Texas |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cost | $ |  | $ 0 | $ 77,139 |
Acres | a |  | 0 | 37,513 |
Washington |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cost | $ |  | $ 1,483 | $ 22,638 |
Acres | a |  | 481 | 5,247 |
New Zealand |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cost | $ |  | $ 21,376 | $ 0 |
Acres | a |  | 7,546 | 0 |

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