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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Components of Provision For Income Taxes | The components of the provision for income taxes are as follows:
| 2019 |  | 2018 |  | 2017
Currently payable: |  |  |  |  |
Federal | $ | 73,563,685 |  |  | $ | 83,010,387 |  |  | $ | 133,166,194 |
State | 3,765,929 |  |  | 3,743,781 |  |  | 3,984,000 |
Foreign | 1,468,018 |  |  | 1,776,837 |  |  | 2,440,000 |
Total | 78,797,632 |  |  | 88,531,005 |  |  | 139,590,194 |
Deferred income tax (benefit) expense: |  |  |  |  |
Primarily federal | (3,066,237 | ) |  | (4,367,155 | ) |  | (14,585,412 | )
Provision for income taxes | $ | 75,731,395 |  |  | $ | 84,163,850 |  |  | $ | 125,004,782 |
Schedule of Effective Income Tax Rates Different From Statutory Federal Income Tax Rates | The effective income tax rates are different from the statutory federal income tax rates for the following reasons:
| 2019 |  | 2018 |  | 2017
Statutory federal income tax rate | 21.0 | % |  | 21.0 | % |  | 35.0 | %
State income taxes, net of federal income tax benefit | 0.6 |  |  | 0.6 |  |  | 0.5 |
Domestic production exclusion | — |  |  | — |  |  | (2.8 | )
Research tax credit | (1.1 | ) |  | (0.8 | ) |  | (0.8 | )
Increase in reserve for uncertain tax provisions | 0.3 |  |  | 0.1 |  |  | 0.1 |
Change in tax rate on deferred taxes | — |  |  | 0.5 |  |  | (7.2 | )
Foreign tax credit | (0.1 | ) |  | (0.1 | ) |  | (0.8 | )
Foreign derived intangible income deduction | (4.8 | ) |  | (4.6 | ) |  | — |
Stock compensation | (1.1 | ) |  | (1.0 | ) |  | (1.0 | )
Other | 0.3 |  |  | 0.4 |  |  | 0.5 |
Effective income tax rate | 15.1 | % |  | 16.1 | % |  | 23.5 | %
Schedule of Deferred Income Tax Assets And Liabilities | The tax effect of temporary differences which give rise to deferred income tax assets and liabilities at December 31, 2019 and 2018, are as follows:
| December 31,
| 2019 |  | 2018
Assets: |  |  |
Accruals not currently deductible | $ | 6,478,146 |  |  | $ | 5,111,242 |
Stock based compensation | 9,100,745 |  |  | 9,586,372 |
Other | 66,830 |  |  | 356,039 |
Total deferred income tax assets | $ | 15,645,721 |  |  | $ | 15,053,653 |
Liabilities: |  |  |
Excess tax over book depreciation | (30,725,471 | ) |  | (39,835,025 | )
Goodwill | (27,799,640 | ) |  | (23,341,226 | )
Intangible assets | (6,171,628 | ) |  | (5,089,042 | )
Other | (2,403,131 | ) |  | (1,309,849 | )
Total deferred income tax liability | $ | (67,099,870 | ) |  | $ | (69,575,142 | )
Net deferred income taxes | $ | (51,454,149 | ) |  | $ | (54,521,489 | )
Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2019 |  | 2018 |  | 2017
Beginning of year | $ | 4,678,000 |  |  | $ | 4,435,000 |  |  | $ | 3,408,000 |
Additions based on tax positions related to the current year | 1,695,000 |  |  | 1,677,000 |  |  | 941,000 |
Additions for tax positions in prior years | 657,000 |  |  | 283,000 |  |  | 289,000 |
Reductions for tax positions in prior years | (38,000 | ) |  | (163,000 | ) |  | (63,000 | )
Reductions as a result of completed audit examinations | — |  |  | (1,554,000 | ) |  | — |
Reductions as a result of a lapse of the applicable statute of limitations | (600,000 | ) |  | — |  |  | (140,000 | )
End of year | $ | 6,392,000 |  |  | $ | 4,678,000 |  |  | $ | 4,435,000 |

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