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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