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Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Goodwill, Acquired During Period | $ 244,161 | $ 244,283
Finite-lived Intangible Assets Acquired | 25,500 |
Historical Cost | 70,333 | 70,333
Accumulated Amortization | (37,791) | (29,848)
Net Balance | $ 32,542 | $ 40,485
Customer relationships |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 9 years 4 months | 9 years 4 months
Historical Cost | $ 62,401 | $ 62,401
Accumulated Amortization | (34,061) | (27,364)
Net Balance | $ 28,340 | $ 35,037
Trade names and trademarks |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 7 years 5 months | 7 years 5 months
Historical Cost | $ 6,786 | $ 6,786
Accumulated Amortization | (3,000) | (1,972)
Net Balance | $ 3,786 | $ 4,814
Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 5 years | 5 years
Historical Cost | $ 574 | $ 574
Accumulated Amortization | (574) | (512)
Net Balance | $ 0 | $ 62
Other Intangible Assets [Member] |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 6 years |
Historical Cost | $ 572 |
Accumulated Amortization | (156) |
Net Balance | $ 416 |
Minimum | Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 5 years |
Maximum | Non-compete agreements |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Useful Life | 10 years |
Pulp and Paperboard |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |
Goodwill, Acquired During Period | $ 35,100 |

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