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Nature of Business Operations (Details) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 30, 2011 a | Dec. 31, 2017 USD ($) a segment core_business_area $ / shares | Dec. 31, 2016 USD ($) a | Dec. 31, 2015 USD ($) | Mar. 31, 2016 | Mar. 03, 2016 | Apr. 30, 2013 | Apr. 04, 2013
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Par value (dollars per share) | $ / shares |  | $ 0 |  |  |  |  |  |
Timberland owned or leased (acres) |  | 2,600,000 |  |  |  |  |  |
Number of reportable business segments | segment |  | 5 |  |  |  |  |  |
Additional interest acquired (as a percent) |  |  |  |  |  |  |  | 39.00%
Ownership interest (as a percent) |  |  |  |  | 77.00% | 77.00% | 65.00% | 65.00%
Timberlands acquired (acres) | 250,000 | 109,533 | 110,727 |  |  |  |  |
Payments to acquire timberlands | $ |  | $ 242,910 | $ 366,481 | $ 98,409 |  |  |  |
Savannah, Georgia to Daytona Beach, Florida |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Timberland owned or leased (acres) |  | 200,000 |  |  |  |  |  |
New Zealand |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Timberlands acquired (acres) |  | 7,546 | 0 |  |  |  |  |
Payments to acquire timberlands | $ |  | $ 21,376 | $ 0 |  |  |  |  |
Florida, Georgia, South Carolina, Washington and New Zealand |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Timberlands acquired (acres) |  | 109,000 |  |  |  |  |  |
U.S. |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Timberlands acquired (acres) |  |  | 111,000 |  |  |  |  |
Payments to acquire timberlands | $ |  |  | $ 366,500 |  |  |  |  |
New Zealand JV |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Additional interest acquired (as a percent) |  |  |  |  |  | 12.00% |  |
New Zealand JV | New Zealand |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Timberland owned or leased (acres) |  | 410,000 |  |  |  |  |  |
Net plantable acres (acres) |  | 293,000 |  |  |  |  |  |
Trading business |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |
Number of core areas of business | core_business_area |  | 2 |  |  |  |  |  |

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