Income Taxes (Tables)

12 Months Ended

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