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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

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
		2017				2016				2015
		(thousands)
Domestic		$	115,083			$	41,703			$	79,414
Foreign		2,505				1,598				1,268
Income before income taxes		$	117,588			$	43,301			$	80,682

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
		2017				2016				2015
		(thousands)
Current income tax provision (benefit)
Federal		$	22,541			$	10,664			$	(2,938	)
State		3,973				2,201				555
Foreign		—				5				—
Total current		26,514				12,870				(2,383		)
Deferred income tax provision (benefit)
Federal		6,747				2,549				27,011
State		991				(1,536		)		3,872
Foreign		379				(8,836		)		—
Total deferred		8,117				(7,823		)		30,883
Income tax provision		$	34,631			$	5,047			$	28,500

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
		2017				2016				2015
		(thousands, except percentages)
Income before income taxes		$	117,588			$	43,301			$	80,682
Statutory U.S. income tax rate		35.0		%		35.0		%		35.0		%
Statutory tax provision		$	41,156			$	15,155			$	28,239
State taxes		3,719				1,370				3,006
Domestic production activities deduction		(963		)		(165		)		(299		)
Unrecognized tax benefits		(86		)		1,717				433
Benefit from enactment of the Tax Cuts and Jobs Act		(8,129		)		—				—
Change in valuation allowance (a)		—				(9,884		)		—
Tax credits		(912		)		(2,904		)		(2,043		)
Other		(154		)		(242		)		(836		)
Total		$	34,631			$	5,047			$	28,500
Effective income tax rate		29.5		%		11.7		%		35.3		%

Net Deferred Tax Assets and Liabilities [Table Text Block]

The components of our net deferred tax assets and liabilities at December 31, 2017 and 2016, are summarized as follows:

		December 31, 2017				December 31, 2016
		(thousands)
Deferred tax assets
Employee benefits		$	30,853			$	54,895
Inventories		4,598				5,237
Foreign net operating loss carryforward		5,137				5,383
Other		6,003				7,628
Net deferred tax assets		$	46,591			$	73,143
Deferred tax liabilities
Property and equipment		$	(47,946	)		$	(62,948	)
Intangible assets and other		(4,168		)		(5,039		)
Other		(1,867		)		(2,655		)
Deferred tax liabilities		$	(53,981	)		$	(70,642	)
Total deferred tax assets (liabilities), net		$	(7,390	)		$	2,501

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:

		2017				2016				2015
		(thousands)
Balance as of January 1		$	2,224			$	878			$	309
Increases related to prior years' tax positions		1				1,657				431
Increases related to current year tax positions		51				104				145
Decreases related to prior years' tax positions		(12		)		—				(7		)
Lapse of statute of limitations		(181		)		—				—
Settlements		—				(415		)		—
Balance as of December 31		$	2,083			$	2,224			$	878

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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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-Name Accounting Standards Codification
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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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