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Investments - Equity Method Investments (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 24, 2017	Dec. 25, 2016	Sep. 25, 2016	Mar. 27, 2016	Sep. 24, 2017	Sep. 25, 2016
Schedule of Equity Method Investments [Line Items]
Investments in joint ventures	$ 20,472,000	$ 15,614,000			$ 20,472,000
Loss from joint ventures	31,557,000		$ 463,000		31,464,000	$ (41,845,000)
Proportionate share of gain after tax and net of noncontrolling interest	(488,000)		0		(488,000)	0
Distributions received	0		0		0	0
Newsprint and supercalendered paper purchased from the Paper Mills	$ 2,300,000		$ 3,700,000		$ 7,700,000	$ 10,300,000
Donohue Malbaie Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%				49.00%
Women in the World Media, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	30.00%				30.00%
Madison Paper Industries
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	40.00%				40.00%
Noncontrolling interest, ownership percentage by parent	10.00%				10.00%
Investment in Madison				$ 0
Gain on sale of non-hydro power assets	$ 30,100,000	$ 3,900,000
Proportionate share of gain after tax and net of noncontrolling interest	$ 16,100,000
Madison Paper Industries \| UPM-Kymmene
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	60.00%				60.00%
Madison Paper Industries \| Paper Mill Closure
Schedule of Equity Method Investments [Line Items]
Loss from joint ventures				41,400,000
Proportionate share of gain after tax and net of noncontrolling interest				$ 20,100,000
Madison Paper Industries Owned Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	80.00%				80.00%
Noncontrolling interest, ownership percentage by parent	20.00%				20.00%
Ownership of Madison Paper Industries by Consolidated Subsidiary
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%				50.00%