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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Taxes [Abstract] |
Schedule Of Provision For Income Taxes |
|  | For the Years Ended December 31,
|  | 2020 |  |  | 2019 |  |  | 2018
Current |  |  |  |  |  |  |  |
U.S. federal | $ | 58,602 |  | $ | 36,779 |  | $ | 23,934
U.S. state and local |  | 15,950 |  |  | 7,078 |  |  | 4,484
Foreign |  | 539 |  |  | 600 |  |  | 452
Deferred |  |  |  |  |  |  |  |
U.S. federal, state and local |  | 1,456 |  |  | (2,773) |  |  | 5,185
Foreign |  | (23) |  |  | 2 |  |  | 1
Total | $ | 76,524 |  | $ | 41,686 |  | $ | 34,056
Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets (Liabilities) |
|  |  | December 31,
|  |  | 2020 |  |  | 2019
| Accrued liabilities | $ | 42,151 |  | $ | 32,498
| Lease liabilities |  | 35,888 |  |  | 32,476
| Implicit price concessions |  | 7,031 |  |  | 4,165
| Stock compensation expense |  | 4,047 |  |  | 5,425
| State net operating loss carryforwards |  | 2,030 |  |  | 2,678
| Other |  | 888 |  |  | 592
| Deferred income tax assets |  | 92,035 |  |  | 77,834
| Amortization of intangible assets |  | (40,619) |  |  | (39,377)
| Right of use lease assets |  | (32,788) |  |  | (28,807)
| Accelerated tax depreciation |  | (31,686) |  |  | (21,942)
| Currents assets |  | (3,921) |  |  | (2,510)
| Market valuation of investments |  | (2,382) |  |  | (2,058)
| State income taxes |  | (1,161) |  |  | (1,477)
| Other |  | (142) |  |  | (167)
| Deferred income tax liabilities |  | (112,699) |  |  | (96,338)
| Net deferred income tax liabilities | $ | (20,664) |  | $ | (18,504)
Schedule Of Significant Changes To Unrecognized Tax Benefits |
|  | 2020 |  |  | 2019 |  |  | 2018
Balance at January 1, | $ | 1,323 |  | $ | 1,348 |  | $ | 1,123
Unrecognized tax benefits due to positions taken in current year |  | 200 |  |  | 234 |  |  | 453
Decrease due to expiration of statute of limitations |  | (219) |  |  | (259) |  |  | (228)
Balance at December 31, | $ | 1,304 |  | $ | 1,323 |  | $ | 1,348
Schedule Of Difference Between Actual Income Tax Provision For Continuing Operations And Income Tax Provision Calculated At Statutory U.S. Federal Tax Rate |
|  | For the Years Ended December 31, |  |
|  | 2020 |  |  | 2019 |  |  | 2018 |  |
Income tax provision calculated using the statutory rate of 21% | $ | 83,158 |  | $ | 54,938 |  | $ | 50,316 |  |
Excess stock compensation tax benefits |  | (26,089) |  |  | (24,177) |  |  | (22,862) |  |
State and local income taxes, less federal income tax effect |  | 13,855 |  |  | 7,880 |  |  | 7,150 |  |
Nondeductible expenses |  | 5,377 |  |  | 3,048 |  |  | 2,280 |  |
Other--net |  | 223 |  |  | (3) |  |  | (2,828) |  |
Income tax provision | $ | 76,524 |  | $ | 41,686 |  | $ | 34,056 |  |
Effective tax rate |  | 19.3 | % |  | 15.9 | % |  | 14.2 | % |
Schedule Of Income Taxes Paid |
2020 | $ | 61,517
2019 |  | 44,063
2018 |  | 9,749

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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://fasb.org/us-gaap/role/ref/legacyRef -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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