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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the period, but did not meet the requisite market condition performance measurement, which resulted in the vested shares settling without payment (excludes forfeited shares and vested shares deferred).

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The number of equity-based payment instruments, excluding stock (or unit) options, which were both vested and deferred during at the end of the reporting period.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during a previous reporting period and were distributed in the current reporting period

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable within one year (or the operating cycle, if longer).

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Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer).

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of fully vested and expected to vest options that are exercisable.

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The number of exercisable share options (fully vested and expected to vest) that may be converted as of the balance sheet date.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options that are exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Equity-Based Compensation Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			12 Months Ended			37 Months Ended
	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 31, 2012	Mar. 31, 2018	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares	657,319		527,054	657,319	527,054	277,693			150,580
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 52.84		$ 51.83	$ 52.84	$ 51.83	$ 64.47			$ 66.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 66.85	$ 66.85		$ 66.85
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Aggregate Intrinsic Value	$ 0		$ 7	$ 0	$ 7	$ 0			$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross				158,484	280,191	142,542
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price				$ 56.45	$ 38.86	$ 61.93
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested Options Forfeited, Number of Shares				(22,306)	(30,830)	(15,429)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price				$ 50.74	$ 47.79	$ 64.12
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures and Expirations in Period				(5,913)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price				$ 66.97
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term				6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term				7 years
Stock Plan, effective date				Dec. 16, 2008
Share Based Compensation Arrangement By Share Based Payment Award Effective Grant Date 2008 Plan Amended and Restated				Feb. 28, 2017
Stock Plan, shares authorized	6,200,000			6,200,000
Shares Available For Grant	3,600,000			3,600,000
Distributed of Previously Deferred Shares	1,775
Cash paid for minimum tax withholdings				$ 1,127	$ 933	$ 4,152
Share based compensation expense				$ (6,453)	(7,605)	(8,630)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	131,947	137,860		131,947
Options, Vested and Expected to be Exercised, Outstanding, Weighted Average Exercise Price	$ 61.95			$ 61.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term				7 years 5 months
Equity Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs	$ 3,100			$ 3,100
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)				1 year 5 months
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				3 years
Unrecognized compensation costs	$ 2,300			$ 2,300
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)				1 year 2 months
Vested Shares Settled Without Payment	41,538			0
Settlement and distribution of shares issued (in shares)			45,953
Shares issued (in shares)		27,878
Share based compensation expense				$ (2,283)	$ (3,311)	$ (4,408)
Performance Shares [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of amount subject to performance share award of number of shares actually issued			0.00%		0.00%
Performance Shares [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of amount subject to performance share award of number of shares actually issued			200.00%		200.00%
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value				$ 18.82	$ 14.42	$ 20.82
Share based compensation expense				$ (2,552)	$ (2,913)	$ (2,106)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value				$ 7,700
Employee Stock Option [Member] \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				1 year
Employee Stock Option [Member] \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				3 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period				10 years
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value				$ 1,100
Unrecognized compensation costs	$ 2,800			$ 2,800
Unrecognized compensation costs, expected weighted-average period to be recognized (in years)				1 year 9 months
Settlement and distribution of shares issued (in shares)	20,940		19,196	25,940	45,143
Shares issued (in shares)				17,834	30,093
Cash paid for minimum tax withholdings				$ 1,100	$ 900
Balance of Shares Vested and Deferred			33,663		33,663
Share based compensation expense				$ (1,618)	$ (1,381)	(2,116)
Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				1 year
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				3 years
Cellu Tissue Holdings Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Plan, shares authorized	700,000			700,000
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation awards vesting period				1 year			3 years
Share based compensation expense				$ 2,800	(4,800)	$ (4,100)
Deferred compensation share-based arrangements, liability, classified, noncurrent	$ (3,600)		$ (7,900)	(3,600)	(7,900)
Deferred Compensation Share-based Arrangements, Liability, Current	$ (2,400)		$ (3,200)	$ (2,400)	$ (3,200)
Scenario, Forecast [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number								124,617