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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Schedule of Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits | The Company follows the provisions of the Financial Accounting Standards Codification 740 (“ASC 740”), “Income Taxes.” A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows:
| 2016 |  | 2015 |  | 2014
Beginning of year | $ | 5,375,000 |  |  | $ | 8,288,000 |  |  | $ | 7,351,000 |
Additions based on tax positions related to the current year | 756,000 |  |  | 1,765,000 |  |  | 1,328,000 |
Additions for tax positions in prior years | 487,000 |  |  | 428,000 |  |  | 634,000 |
Reductions for tax positions in prior years | (2,949,000 | ) |  | (336,000 | ) |  | (676,000 | )
Reductions as a result of completed audit examinations | — |  |  | (4,162,000 | ) |  | — |
Reductions as a result of a lapse of the applicable statute of limitations | (261,000 | ) |  | (608,000 | ) |  | (349,000 | )
End of year | $ | 3,408,000 |  |  | $ | 5,375,000 |  |  | $ | 8,288,000 |
Schedule of Components of Provision For Income Taxes | The components of the provision for income taxes are as follows:
| 2016 |  | 2015 |  | 2014
Currently payable: |  |  |  |  |
Federal | $ | 136,124,497 |  |  | $ | 129,379,597 |  |  | $ | 108,689,911 |
State | 3,805,000 |  |  | 2,908,000 |  |  | 2,236,000 |
Foreign | 540,000 |  |  | 276,000 |  |  | 978,000 |
Total | 140,469,497 |  |  | 132,563,597 |  |  | 111,903,911 |
Net deferred: |  |  |  |  |
Primarily federal | 22,500,000 |  |  | 12,558,000 |  |  | 14,818,000 |
Provision for income taxes | $ | 162,969,497 |  |  | $ | 145,121,597 |  |  | $ | 126,721,911 |
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:
| 2016 |  | 2015 |  | 2014
Statutory federal income tax rate | 35.00 | % |  | 35.00 | % |  | 35.00 | %
State income taxes, net of federal income tax benefit | 0.50 |  |  | 0.40 |  |  | 0.30 |
Domestic production exclusion | (2.70 | ) |  | (2.80 | ) |  | (2.60 | )
Research tax credit (1) | (0.80 | ) |  | (0.80 | ) |  | (2.00 | )
Reduction in Reserve for Uncertain Tax Provisions | (0.20 | ) |  | (0.60 | ) |  | — |
Other | 0.10 |  |  | 0.10 |  |  | (0.20 | )
Effective income tax rate | 31.90 | % |  | 31.30 | % |  | 30.50 | %
(1) - Research tax credits applied in 2014 related to prior tax year amended tax filings were approximately 1.3 percentage points of the 2 percentage point reduction in the effective income tax rate.
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, 2016 and 2015, are as follows:
| December 31,
| 2016 |  | 2015
Assets: |  |  |
Accruals not currently deductible | $ | 4,282,470 |  |  | $ | 4,157,660 |
Stock based compensation | 18,701,361 |  |  | 20,360,105 |
Other | 3,924,945 |  |  | 3,928,824 |
Total deferred income tax assets | 26,908,776 |  |  | 28,446,589 |
Liabilities: |  |  |
Excess tax over book depreciation | (65,642,206 | ) |  | (53,538,861 | )
Goodwill | (23,225,969 | ) |  | (16,047,068 | )
Unrealized gain on investments | (1,435,322 | ) |  | (961,980 | )
Intangible assets | (5,368,886 | ) |  | (3,056,712 | )
Other | (2,449,012 | ) |  | (2,114,430 | )
Net deferred income taxes | $ | (71,212,619 | ) |  | $ | (47,272,462 | )
As further described in Note 1. Summary of Significant Accounting Policies, the Company adopted ASU 2015-17, Balance Sheet Classification of Deferred Taxes, on a prospective basis (prior periods were not retrospectively adjusted) in the first quarter of 2016. As a result, deferred tax liabilities and assets are classified as long-term in the consolidated balance sheet as of December 31, 2016. Net current and non-current tax assets and liabilities are included in the consolidated balance sheets as follows:
|  | December 31,
|  | 2016 |  | 2015
Current assets |  | — |  |  | 24,366,588 |
Current liabilities |  | — |  |  | (2,114,430 | )
Long-term assets |  | 26,908,776 |  |  | 4,080,001 |
Long-term liabilities |  | (98,121,395 | ) |  | (73,604,621 | )
Total deferred tax liability |  | $ | (71,212,619 | ) |  | $ | (47,272,462 | )

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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=65882285&loc=d3e32639-109319 + Details
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