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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of deferred tax assets and liabilities |
| December 31,
| 2017 |  | 2016
Deferred tax assets: |  |  |
Allowance for doubtful accounts | $ | 1,885 |  |  | $ | 2,686 |
Tax credits | 7,179 |  |  | 9,363 |
Other accruals | 97,247 |  |  | 153,955 |
Net operating losses | 346 |  |  | 304 |
Other | 14,784 |  |  | 19,870 |
Total deferred tax assets | 121,441 |  |  | 186,178 |
Deferred tax liabilities: |  |  |
Inventories | 55,965 |  |  | 76,694 |
Property and equipment | 122,354 |  |  | 157,228 |
Other | 28,528 |  |  | 42,422 |
Total deferred tax liabilities | 206,847 |  |  | 276,344 |
Net deferred tax liabilities | $ | (85,406 | ) |  | $ | (90,166 | )
Schedule of components of the provision for income taxes |
| For the Year Ended December 31, 2017
| Current |  | Deferred |  | Total
Federal income tax expense (benefit) | $ | 467,577 |  |  | $ | (13,053 | ) |  | $ | 454,524 |
State income tax expense | 41,183 |  |  | 8,293 |  |  | 49,476 |
Net income tax expense (benefit) | $ | 508,760 |  |  | $ | (4,760 | ) |  | $ | 504,000 |
| For the Year Ended December 31, 2016
| Current |  | Deferred |  | Total
Federal income tax expense | $ | 540,090 |  |  | $ | 7,558 |  |  | $ | 547,648 |
State income tax expense | 49,016 |  |  | 2,836 |  |  | 51,852 |
Net income tax expense | $ | 589,106 |  |  | $ | 10,394 |  |  | $ | 599,500 |
| For the Year Ended December 31, 2015
| Current |  | Deferred |  | Total
Federal income tax expense (benefit) | $ | 504,558 |  |  | $ | (21,973 | ) |  | $ | 482,585 |
State income tax expense (benefit) | 47,242 |  |  | (677 | ) |  | 46,565 |
Net income tax expense (benefit) | $ | 551,800 |  |  | $ | (22,650 | ) |  | $ | 529,150 |
Reconciliation of the provision for income taxes to the amounts computed at the federal statutory rate |
| For the Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Federal income taxes at statutory rate | $ | 573,231 |  |  | $ | 573,020 |  |  | $ | 511,128 |
State income taxes, net of federal tax benefit | 39,062 |  |  | 35,285 |  |  | 32,137 |
Excess tax benefit from share-based compensation | (48,688 | ) |  | — |  |  | — |
Revaluation of deferred tax liability | (53,240 | ) |  | — |  |  | — |
Other items, net | (6,365 | ) |  | (8,805 | ) |  | (14,115 | )
Total provision for income taxes | $ | 504,000 |  |  | $ | 599,500 |  |  | $ | 529,150 |
Summary of changes in gross amount of unrecognized tax benefits, excluding interest and penalties |
| 2017 |  | 2016 |  | 2015
Unrealized tax benefit, balance at January 1, | $ | 34,798 |  |  | $ | 36,928 |  |  | $ | 49,598 |
Additions based on tax positions related to the current year | 6,299 |  |  | 6,116 |  |  | 5,405 |
Additions based on tax positions related to prior years | — |  |  | — |  |  | 995 |
Payments related to items settled with taxing authorities | — |  |  | (195 | ) |  | (4,012 | )
Reductions due to the lapse of statute of limitations and settlements | (5,709 | ) |  | (8,051 | ) |  | (15,058 | )
Unrealized tax benefit, balance at December 31, | $ | 35,388 |  |  | $ | 34,798 |  |  | $ | 36,928 |

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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=84230637&loc=d3e32639-109319 + Details
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