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Investments - Equity Method Investments (Details) - USD ($)
3 Months Ended
Mar. 26, 2017
Dec. 25, 2016
Mar. 27, 2016
Schedule of Equity Method Investments [Line Items]      
Investments in joint ventures $ 16,492,000 $ 15,614,000  
Loss from joint ventures (173,000)   $ 41,896,000
Distributions received 0   0
Newsprint and supercalendered paper purchased from the Paper Mills $ 3,000,000   3,000,000
Donohue Malbaie Inc.      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 49.00%    
Madison Paper Industries      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 40.00%    
Noncontrolling interest, ownership percentage by parent 10.00%    
Investment in Madison     0
Gain on sale of non-hydro power assets   $ 3,900,000  
Women in the World Media, LLC      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 30.00%    
Madison Paper Industries Owned Consolidated Subsidiary      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 80.00%    
Noncontrolling interest, ownership percentage by parent 20.00%    
Ownership of Madison Paper Industries by Consolidated Subsidiary      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 50.00%    
Accrued Expenses and Other      
Schedule of Equity Method Investments [Line Items]      
Obligation to fund losses of equity method investment     28,800,000
UPM-Kymmene | Madison Paper Industries      
Schedule of Equity Method Investments [Line Items]      
Equity method investment, ownership percentage 60.00%    
Paper Mill Closure | Madison Paper Industries      
Schedule of Equity Method Investments [Line Items]      
Loss from joint ventures     $ (41,400,000)