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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Income before Income Tax, Domestic and Foreign [Table Text Block]

Income before income taxes includes the following components:

		Year Ended December 31
		2016				2015				2014
		(thousands)
Domestic		$	41,703			$	79,414			$	122,727
Foreign		1,598				1,268				578
Income before income taxes		$	43,301			$	80,682			$	123,305

Income Tax Provision (Benefit) [Table Text Block]

The income tax provision shown in the Consolidated Statements of Operations includes the following:

		Year Ended December 31
		2016				2015				2014
		(thousands)
Current income tax provision (benefit)
Federal		$	10,664			$	(2,938	)		$	27,568
State		2,201				555				5,023
Foreign		5				—				—
Total current		12,870				(2,383		)		32,591
Deferred income tax provision (benefit)
Federal		2,549				27,011				9,740
State		(1,536		)		3,872				965
Foreign		(8,836		)		—				—
Total deferred		(7,823		)		30,883				10,705
Income tax provision		$	5,047			$	28,500			$	43,296

Income Tax Rate Reconciliation [Table Text Block]

The effective tax rate varies from the U.S. Federal statutory income tax rate principally due to the following:

		Year Ended December 31
		2016				2015				2014
		(thousands, except percentages)
Income before income taxes		$	43,301			$	80,682			$	123,305
Statutory U.S. income tax rate		35.0		%		35.0		%		35.0		%
Statutory tax provision		$	15,155			$	28,239			$	43,157
State taxes		1,370				3,006				4,097
Domestic production activities deduction		(165		)		(299		)		(2,031		)
Unrecognized tax benefits		1,717				433				313
Change in valuation allowance		(9,884		)		—				—
Tax credits		(2,904		)		(2,043		)		(2,581		)
Other		(242		)		(836		)		341
Total		$	5,047			$	28,500			$	43,296
Effective income tax rate		11.7		%		35.3		%		35.1		%

Net Deferred Tax Assets and Liabilities [Table Text Block]

The components of our net deferred tax assets and liabilities at December 31, 2016 and 2015, are summarized as follows:

		December 31, 2016				December 31, 2015
		(thousands)
Deferred tax assets
Employee benefits		$	54,895			$	52,840
Inventories		5,237				6,618
Foreign net operating loss carryforward		5,383				5,440
Other		7,628				8,070
Gross deferred tax assets		73,143				72,968
Valuation allowance (a)		—				(9,884		)
Net deferred tax assets		$	73,143			$	63,084
Deferred tax liabilities
Property and equipment		$	62,948			$	56,061
Intangible assets and other		5,039				5,264
Other		2,655				851
Deferred tax liabilities		$	70,642			$	62,176
Total deferred tax assets, net		$	2,501			$	908

______________________________________ 

(a) As of December 31, 2016 and 2015, the deferred tax assets in our foreign subsidiaries were primarily the result of net operating losses. As of each reporting date, management considers new evidence, both positive and negative, that could affect its view of the future realization of deferred tax assets. During fourth quarter 2016, because we achieved three years of cumulative pretax income in the Canadian tax jurisdiction and due to the implementation of a tax-planning strategy, management determined that there is sufficient positive evidence to conclude that it is more likely than not that the deferred tax assets are realizable and therefore released the valuation allowance in the amount of $9.9 million.

Unrecognized Tax Benefits Roll Forward [Table Text Block]

The following table summarizes the changes related to our gross unrecognized tax benefits excluding interest and penalties:

		2016				2015				2014
		(thousands)
Balance as of January 1		$	878			$	309			$	—
Increases related to prior years' tax positions		1,657				431				172
Increases related to current year tax positions		104				145				137
Decreases related to prior years' tax positions		—				(7		)		—
Settlements		(415		)		—				—
Balance as of December 31		$	2,224			$	878			$	309

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Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years.

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-Publisher FASB
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Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets.

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Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations.

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Tabular disclosure of income before income tax between domestic and foreign jurisdictions.

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Tabular disclosure of the change in unrecognized tax benefits.

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