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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Taxes [Abstract] |
Schedule Of Provision For Income Taxes |
|  | For the Years Ended December 31,
|  | 2019 |  |  | 2018 |  |  | 2017
Current |  |  |  |  |  |  |  |
U.S. federal | $ | 36,779 |  | $ | 23,934 |  | $ | 11,724
U.S. state and local |  | 7,078 |  |  | 4,484 |  |  | 4,144
Foreign |  | 600 |  |  | 452 |  |  | 465
Deferred |  |  |  |  |  |  |  |
U.S. federal, state and local |  | (2,773) |  |  | 5,185 |  |  | 2,402
Foreign |  | 2 |  |  | 1 |  |  | 5
Total | $ | 41,686 |  | $ | 34,056 |  | $ | 18,740
Schedule Of Temporary Differences That Give Rise To Deferred Tax Assets (Liabilities) |
|  |  | December 31,
|  |  | 2019 |  |  | 2018
| Accrued liabilities | $ | 32,498 |  | $ | 30,702
| Lease liabilities |  | 32,476 |  |  | -
| Stock compensation expense |  | 5,425 |  |  | 5,894
| Implicit price concessions |  | 4,165 |  |  | 1,171
| State net operating loss carryforwards |  | 2,678 |  |  | 2,422
| Other |  | 894 |  |  | 626
| Deferred income tax assets |  | 78,136 |  |  | 40,815
| Amortization of intangible assets |  | (39,679) |  |  | (38,346)
| Right of use lease assets |  | (28,807) |  |  | -
| Accelerated tax depreciation |  | (21,942) |  |  | (19,685)
| Currents assets |  | (2,510) |  |  | (1,861)
| Market valuation of investments |  | (2,058) |  |  | (1,068)
| State income taxes |  | (1,477) |  |  | (1,261)
| Other |  | (167) |  |  | (192)
| Deferred income tax liabilities |  | (96,640) |  |  | (62,413)
| Net deferred income tax liabilities | $ | (18,504) |  | $ | (21,598)
Schedule Of Significant Changes To Unrecognized Tax Benefits |
|  | 2019 |  |  | 2018 |  |  | 2017
Balance at January 1, | $ | 1,348 |  | $ | 1,123 |  | $ | 1,069
Unrecognized tax benefits due to positions taken in current year |  | 234 |  |  | 453 |  |  | 268
Decrease due to expiration of statute of limitations |  | (259) |  |  | (228) |  |  | (214)
Balance at December 31, | $ | 1,323 |  | $ | 1,348 |  | $ | 1,123
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, |  |
|  | 2019 |  |  | 2018 |  |  | 2017 |  |
Income tax provision calculated using the statutory rate of 21% | $ | 54,938 |  | $ | 50,316 |  | $ | 40,921 |  |
Stock compensation tax benefits |  | (24,177) |  |  | (22,862) |  |  | (18,932) |  |
State and local income taxes, less federal income tax effect |  | 7,880 |  |  | 7,150 |  |  | 4,600 |  |
Nondeductible expenses |  | 3,048 |  |  | 2,280 |  |  | 1,041 |  |
Enactment of the tax reform act |  | - |  |  | - |  |  | (8,305) |  |
Other--net |  | (3) |  |  | (2,828) |  |  | (585) |  |
Income tax provision | $ | 41,686 |  | $ | 34,056 |  | $ | 18,740 |  |
Effective tax rate |  | 15.9 | % |  | 14.2 | % |  | 16.0 | % |
Schedule Of Income Taxes Paid |
2019 |  | $ | 44,063
2018 |  |  | 9,749
2017 |  |  | 42,311

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