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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
Income Tax Disclosure [Abstract] |
Income Tax Rate Reconciliation [Table Text Block] | (dollars in thousands):
|  | Year Ended December 31
|  | 2014 |  | 2013
Income before income taxes |  | $ | 123,305 |  |  | $ | 78,148 |
Statutory U.S. income tax rate |  | 35.0 | % |  | 35.0 | %
Statutory tax provision |  | $ | 43,157 |  |  | $ | 27,352 |
State taxes |  | 4,097 |  |  | 2,545 |
Domestic production activities deduction |  | (2,031 | ) |  | (1,326 | )
Other |  | (1,927 | ) |  | 1,307 |
Total |  | $ | 43,296 |  |  | $ | 29,878 |
Effective income tax rate excluding discrete item |  | 35.1 | % |  | 38.2 | %
Recognition of beginning deferred tax balances |  | $ | — |  |  | $ | (68,666 | )
Income tax provision (benefit) with discrete item |  | $ | 43,296 |  |  | $ | (38,788 | )
Effective income tax rate with discrete item |  | 35.1 | % |  | (49.6 | )%
Income Tax Provision (Benefit) [Table Text Block] | The income tax provision (benefit) shown in the Consolidated Statements of Operations includes the following (dollars in thousands):
|  | Year Ended December 31
|  | 2014 |  | 2013
Current income tax provision (benefit) |  |  |  |
Federal |  | $ | 27,568 |  |  | $ | 17,618 |
State |  | 5,023 |  |  | 3,172 |
Foreign |  | — |  |  | 22 |
Total current |  | 32,591 |  |  | 20,812 |
Deferred income tax provision (benefit) |  |  |  |
Federal |  | 9,740 |  |  | (54,611 | )
State |  | 965 |  |  | (4,989 | )
Foreign |  | — |  |  | — |
Total deferred |  | 10,705 |  |  | (59,600 | )
Income tax provision (benefit) |  | $ | 43,296 |  |  | $ | (38,788 | )
Net Deferred Tax Assets and Liabilities [Table Text Block] | The components of our net deferred tax assets and liabilities at December 31, 2014 and 2013, are as follows (dollars in thousands):
|  | December 31, 2014 |  | December 31, 2013
Deferred tax assets |  |  |  |
Employee benefits (a) |  | $ | 81,414 |  |  | $ | 55,331 |
Deferred financing costs |  | 455 |  |  | 540 |
Intangible assets and other |  | 227 |  |  | 386 |
Inventories |  | 6,733 |  |  | 4,657 |
Canadian net operating loss carryforward (b) |  | 15,839 |  |  | 17,180 |
Other |  | 3,587 |  |  | 3,803 |
Gross deferred tax assets |  | 108,255 |  |  | 81,897 |
Valuation allowance (b) |  | (15,839 | ) |  | (17,180 | )
Net deferred tax assets |  | $ | 92,416 |  |  | $ | 64,717 |
Deferred tax liabilities |  |  |  |
Property and equipment |  | $ | 50,199 |  |  | $ | 40,976 |
Intangible assets and other |  | 4,531 |  |  | 3,968 |
Other |  | 691 |  |  | 862 |
Deferred tax liabilities |  | $ | 55,421 |  |  | $ | 45,806 |
As reported on our Consolidated Balance Sheets |  |  |  |
Current deferred tax assets, net |  | $ | 20,311 |  |  | $ | 18,151 |
Noncurrent deferred tax assets, net |  | 16,684 |  |  | 760 |
Total deferred tax assets, net |  | $ | 36,995 |  |  | $ | 18,911 |
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(a) | As of December 31, 2014, the increase relates to the tax effect of changes in recorded pension liabilities. See Note 7, Retirement and Benefit Plans, for more information.
(b) | We have an investment in foreign subsidiaries, which at December 31, 2014 and 2013, had $15.8 million and $17.2 million, respectively, of deferred tax assets. The deferred tax assets resulted primarily from net operating losses and were fully offset by a valuation allowance. The net operating losses will expire beginning in 2015 and the proceeding 20 years.
Pretax income (loss) from domestic and foreign sources is as follows (dollars in thousands):
|  | Year Ended December 31
|  | 2014 |  | 2013
Domestic |  | $ | 122,727 |  |  | $ | 82,529 |
Foreign |  | 578 |  |  | (4,381 | )
Income before income taxes |  | $ | 123,305 |  |  | $ | 78,148 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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