Summary of Significant Accouting Policies Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								7 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 16, 2013	Sep. 30, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013		Dec. 15, 2015	Dec. 15, 2014	Feb. 05, 2014	Jan. 17, 2013	Dec. 27, 2010
Property, Plant and Equipment [Line Items]
Restricted cash	$ 2,270				$ 1,500						$ 2,270		$ 1,500
Allowance for doubtful accounts	1,400				1,400						1,400		1,400
Provision for doubtful accounts											200		100		$ 1,500
Goodwill	209,087				209,087						209,087		209,087
Net sales	$ 431,595	$ 442,222	$ 444,558	$ 434,026	472,318	$ 511,142	$ 498,759	$ 484,920			$ 1,752,401	[1]	$ 1,967,139	[1]	$ 1,889,830	[1]
Percentage of expected natural gas requirement covered under contract for next fiscal year	44.00%										44.00%
Percentage Of Expected Natural Gas Requirement Covered Under Contract For Next Fiscal Quarter	59.00%										59.00%
Percentage of natural gas requirement covered under contract											57.00%		58.00%		16.00%
Common Stock
Property, Plant and Equipment [Line Items]
Common stock authorized (in shares)																	$ 100,000	$ 100,000	$ 100,000	$ 100,000
Number of shares repurchased (in shares)										1,574,748	1,881,921
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)										$ 63.50	$ 53.13
Common Stock | Open Market Share Repurchase [Member]
Property, Plant and Equipment [Line Items]
Common stock authorized (in shares)					50,000								$ 50,000
Number of shares repurchased (in shares)													1,030,657
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)													$ 48.51
Common Stock | Accelerated Share Buyback Agreement [Member]
Property, Plant and Equipment [Line Items]
Number of shares repurchased (in shares)									1,039,513
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)									$ 48.10
Sales Revenue, Net [Member]
Property, Plant and Equipment [Line Items]
Percentage of total revenue from single customer													10.00%
Consumer Products
Property, Plant and Equipment [Line Items]
Net sales											$ 959,894		$ 1,183,385		$ 1,149,692	[1]
Kroger Company | Consumer Products
Property, Plant and Equipment [Line Items]
Net sales											$ 215,000				$ 204,000
Kroger Company | Consumer Products | Sales Revenue, Net [Member]
Property, Plant and Equipment [Line Items]
Percentage of total revenue from single customer											12.30%				10.80%
Cellu Tissue Holdings Inc
Property, Plant and Equipment [Line Items]
Goodwill																					$ 229,500
Land Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life											10 years
Land Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life											40 years
Building and Building Improvements | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life											10 years
Building and Building Improvements | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life											40 years
Machinery and Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life											5 years
Machinery and Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life											25 years
Office And Other Equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life											2 years
Office And Other Equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life											15 years
Other Assets
Property, Plant and Equipment [Line Items]
Restricted Cash and Cash Equivalents, Noncurrent					$ 2,300								$ 2,300

[1] 1 In 2013, pulp not utilized internally was sold by the Pulp and Paperboard segment to external customers resulting in net sales of $5.8 million. Commencing in 2014, the majority of excess pulp is sold by the Consumer Products segment and during 2015 and 2014 totaled $1.4 million and $2.1 million, respectively.