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Commitments (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) lease | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Commitments |  |  |
2018 | $ 11,792 |  |
2019 | 6,522 |  |
2020 | 6,277 |  |
2021 | 4,017 |  |
2022 | 3,562 |  |
Thereafter | 6,245 |  |
Total | 38,415 |  |
Commitments: |  |  |
2018 | 22,625 |  |
2019 | 16,739 |  |
2020 | 16,050 |  |
2021 | 13,522 |  |
2022 | 12,987 |  |
Thereafter | 162,112 |  |
Total | 244,035 |  |
Pension contribution requirements in next fiscal year | $ 2,900 |  |
Matariki Crown Forest Licenses |  |  |
Commitments: |  |  |
Future minimum payments included, years | 20 years |  |
Termination notice | 35 years |  |
Renewal term | 1 year |  |
Number of leases under termination notice | lease | 3 |  |
Number of fixed term forest leases expiring | lease | 2 |  |
Operating Leases |  |  |
Operating Leased Assets [Line Items] |  |  |
Lease expenses | $ 1,992 | $ 2,049 | $ 2,349
Leases: |  |  |
2018 | 1,135 |  |
2019 | 914 |  |
2020 | 733 |  |
2021 | 639 |  |
2022 | 608 |  |
Thereafter | 635 |  |
Total | 4,664 |  |
Timber Leases |  |  |
Operating Leased Assets [Line Items] |  |  |
Lease expenses | 10,731 | $ 10,710 | $ 11,342
Leases: |  |  |
2018 | 9,698 |  |
2019 | 9,303 |  |
2020 | 9,040 |  |
2021 | 8,866 |  |
2022 | 8,817 |  |
Thereafter | 155,232 |  |
Total | $ 200,956 |  |
Timber Leases | United States | Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Lessee leasing arrangements, operating leases, term of contract (in years) | 30 years |  |
Timber Leases | United States | Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Lessee leasing arrangements, operating leases, term of contract (in years) | 65 years |  |
Timber Leases | New Zealand | Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Lessee leasing arrangements, operating leases, term of contract (in years) | 30 years |  |
Timber Leases | New Zealand | Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Lessee leasing arrangements, operating leases, term of contract (in years) | 99 years |  |

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