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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2014
Components of Income Tax (Benefit) Expense | The components of income tax (benefit) expense are:
|  | 2014 |  |  | 2013 |  |  | 2012 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | (4,256 | ) |  | $ | 12,285 |  |  | $ | 17,448 |
State |  |  | 251 |  |  |  | 3,007 |  |  |  | 2,528 |
Foreign |  |  | 934 |  |  |  | 1,101 |  |  |  | 1,027 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | 3,492 |  |  |  | 2,213 |  |  |  | (590 | )
State |  |  | (872 | ) |  |  | 310 |  |  |  | (387 | )
|  | $ | (451 | ) |  | $ | 18,916 |  |  | $ | 20,026 |
Total Income Tax Expense Applying U.S. Federal Income Tax Rate | Total income tax expense differed from the amounts computed by applying the U.S. Federal income tax rate of 35.0% to income before income tax expense as a result of the following:
|  | 2014 |  |  | 2013 |  |  | 2012 |
Computed tax expense at statutory federal rates |  | $ | 1,536 |  |  | $ | 18,678 |  |  | $ | 19,911 |
Increase (decrease) in taxes resulting from: |  |  |  |  |  |  |  |  |  |  |  |
State taxes, net of federal income tax benefit |  |  | (11 | ) |  |  | 1,983 |  |  |  | 1,947 |
Domestic production deduction |  |  | 420 |  |  |  | (1,142 | ) |  |  | (1,661 | )
Income tax credits |  |  | (728 | ) |  |  | (724 | ) |  |  | (395 | )
Foreign tax rate differential |  |  | (2,159 | ) |  |  | (1,459 | ) |  |  | (195 | )
Subpart F income |  |  | 338 |  |  |  | — |  |  |  | 87 |
Other expenses |  |  | 153 |  |  |  | 1,580 |  |  |  | 332 |
|  | $ | (451 | ) |  | $ | 18,916 |  |  | $ | 20,026 |
Components of Income before Provision | The components of income before provision for income tax expense (benefit) are as follows:
|  | 2014 |  |  | 2013 |  |  | 2012 |
Domestic |  | $ | (5,196 | ) |  | $ | 46,520 |  |  | $ | 53,361 |
Foreign |  |  | 8,840 |  |  |  | 7,314 |  |  |  | 3,491 |
|  | $ | 3,644 |  |  | $ | 53,834 |  |  | $ | 56,852 |
Deferred Tax Assets and Liability | Temporary differences between the financial statement carrying amounts and tax bases of assets and liabilities that give rise to significant portions of the net deferred tax liability at December 31, 2014 and 2013 relate to the following:
|  | 2014 |  |  | 2013 |
Current: |  |  |  |  |  |  |  |
Inventories |  | $ | 5,558 |  |  | $ | 4,398 |
State income taxes |  |  | (633 | ) |  |  | (331 | )
Vacation pay accrual |  |  | 776 |  |  |  | 648 |
Accrued bonuses |  |  | 95 |  |  |  | 1,791 |
Bad debt |  |  | 45 |  |  |  | 169 |
Prepaid expenses |  |  | (1,314 | ) |  |  | (1,929 | )
Stock compensation |  |  | 2,446 |  |  |  | 1,281 |
Other |  |  | 1,758 |  |  |  | 494 |
Net deferred tax asset |  | $ | 8,731 |  |  | $ | 6,521 |
Non-Current: |  |  |  |  |  |  |  |
Plant and equipment, principally due to differences in depreciation and capitalized interest |  | $ | (28,365 | ) |  | $ | (25,662 | )
NOL Carryforward |  |  | 361 |  |  |  | — |
Tax credit |  |  | 319 |  |  |  | 14 |
Fair value adjustment |  |  | — |  |  |  | 207 |
Other |  |  | (474 | ) |  |  | 2,111 |
Net deferred tax liability |  |  | (28,159 | ) |  |  | (23,330 | )
Total net deferred tax liability |  | $ | (19,428 | ) |  | $ | (16,809 | )
Gross Unrecognized Tax Liabilities | The following is a roll-forward of the Company’s total gross unrecognized tax liabilities, not including interest and penalties, for the fiscal year ended December 31, 2014:
|  | 2014 |  |  | 2013 |
|  | Gross Unrecognized Tax Liabilities |  |  | Gross Unrecognized Tax Liabilities |
Balance at December 31, 2013 |  | $ | 1,692 |  |  | $ | 282 |
Additions for tax positions related to the current year |  |  | 140 |  |  |  | 1,290 |
Additions for tax positions related to the prior year |  |  | 499 |  |  |  | 161 |
Deletion for tax positions related to the prior year |  |  | (373 | ) |  |  | (41 | )
Balance at December 31, 2014 |  | $ | 1,958 |  |  | $ | 1,692 |

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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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- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Tabular disclosure of the change in unrecognized tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 55 -Paragraph 217 -URI http://asc.fasb.org/extlink&oid=32707879&loc=d3e36027-109320 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=6907707&loc=SL6600010-109319 + Details
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