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Other Assets - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 8,776 | $ 8,679 | $ 8,478
Capitalized debt issuance costs | 300 | 500 |
Capitalized Software | 4,100 | 4,100 |
Pacific Northwest |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Prepaid roads | 3,700 | 3,200 |
New Zealand |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Prepaid roads | $ 2,700 | $ 2,200 |
Software Costs |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization period, in years | 5 years |  |
New Zealand JV | New Zealand Timber |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 8,800 |  |

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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128487-111756 + Details
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