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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Provision for Income Taxes | The provision for income taxes is comprised of (in thousands):
|  | Years ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 17,557 |  |  | $ | 18,307 |  |  | $ | 13,939 |
State |  |  | 3,302 |  |  |  | 3,472 |  |  |  | 2,989 |
|  |  | 20,859 |  |  |  | 21,779 |  |  |  | 16,928 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (5,895 | ) |  |  | (338 | ) |  |  | (1,255 | )
State |  |  | (284 | ) |  |  | (267 | ) |  |  | (260 | )
|  |  | (6,179 | ) |  |  | (605 | ) |  |  | (1,515 | )
Total tax expense |  | $ | 14,680 |  |  | $ | 21,174 |  |  | $ | 15,413 |
Reconciliation Between Effective Tax Rate on Net Income (Loss) and Federal Statutory Tax Rate | The reconciliation between our effective tax rate on net income and the federal statutory rate is as follows (dollars in thousands):
|  | Years ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Income tax at federal statutory rate |  | $ | 19,537 |  |  |  | 35.0 | % |  | $ | 20,864 |  |  |  | 35.0 | % |  | $ | 14,676 |  |  |  | 35.0 | %
Stock compensation |  |  | (581 | ) |  |  | (1.0 | %) |  |  | (227 | ) |  |  | (0.4 | %) |  |  | — |  |  |  | 0.0 | %
Qualified Production Activity Deduction |  |  | (1,715 | ) |  |  | (3.1 | %) |  |  | (1,776 | ) |  |  | (3.0 | %) |  |  | (1,347 | ) |  |  | (3.2 | %)
Other permanent items |  |  | 197 |  |  |  | 0.4 | % |  |  | (92 | ) |  |  | (0.1 | %) |  |  | (69 | ) |  |  | (0.2 | %)
Change in valuation allowance |  |  | 285 |  |  |  | 0.5 | % |  |  | 442 |  |  |  | 0.7 | % |  |  | 467 |  |  |  | 1.1 | %
Change in uncertain tax positions |  |  | (1,807 | ) |  |  | (3.2 | %) |  |  | 66 |  |  |  | 0.1 | % |  |  | (559 | ) |  |  | (1.3 | %)
State income taxes, net of federal benefit |  |  | 2,150 |  |  |  | 3.8 | % |  |  | 1,897 |  |  |  | 3.2 | % |  |  | 2,245 |  |  |  | 5.4 | %
Rate impact of the Tax Act |  |  | (3,386 | ) |  |  | (6.1 | %) |  |  | — |  |  |  | — | % |  |  | — |  |  |  | — | %
Total tax expense |  | $ | 14,680 |  |  |  | 26.3 | % |  | $ | 21,174 |  |  |  | 35.5 | % |  | $ | 15,413 |  |  |  | 36.8 | %
Net Deferred Tax Asset or Liability | Components of the net deferred tax asset or liability are as follows (in thousands):
|  | As of December 31, |
|  | 2017 |  |  | 2016 |
Deferred Tax Assets |  |  |  |  |  |  |  |
Long-term |  |  |  |  |  |  |  |
Accrued reserves and allowances |  | $ | 3,916 |  |  | $ | 1,866 |
Allowance for doubtful accounts |  |  | 426 |  |  |  | 448 |
Inventories |  |  | 213 |  |  |  | 284 |
Intangibles |  |  | 3,279 |  |  |  | 806 |
Net operating loss carryforwards |  |  | 2,623 |  |  |  | 2,921 |
Other current and long-term |  |  | 10 |  |  |  | 2 |
Long-term deferred tax assets |  |  | 10,467 |  |  |  | 6,327 |
Less: Valuation allowance |  |  | (1,746 | ) |  |  | (2,415 | )
Net deferred tax assets |  |  | 8,721 |  |  |  | 3,912 |
Deferred Tax Liabilities |  |  |  |  |  |  |  |
Long-term |  |  |  |  |  |  |  |
Accrued reserves and allowances |  |  | (308 | ) |  |  | (565 | )
Property and equipment |  |  | (1,453 | ) |  |  | (1,505 | )
Intangibles |  |  | (3,543 | ) |  |  | (4,899 | )
Investment in partnership |  |  | (9,189 | ) |  |  | (9,530 | )
Other |  |  | (208 | ) |  |  | (62 | )
Long-term deferred tax liabilities |  |  | (14,701 | ) |  |  | (16,561 | )
Net deferred tax liabilities |  | $ | (5,980 | ) |  | $ | (12,649 | )
Rollforward of Gross Unrecognized Tax Benefits | A rollforward of the gross unrecognized tax benefits is as follows (in thousands):
Unrecognized tax benefit, January 1, 2016 |  | $ | 3,586 |
Increase as a result of tax positions taken during the period |  |  | 2,354 |
Decrease as a result of tax positions taken during the period |  |  | (1,356 | )
Decrease as a result of expiring statutes |  |  | (487 | )
Unrecognized tax benefit, December 31, 2016 |  |  | 4,097 |
Increase as a result of tax positions taken during the period |  |  | 4,353 |
Decrease as a result of tax positions taken during the period |  |  | (2,311 | )
Decrease as a result of expiring statutes |  |  | (1,689 | )
Unrecognized tax benefit, December 31, 2017 |  | $ | 4,450 |

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