Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	May 23, 2018	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 14, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value of options granted		$ 58.95	$ 82.28
Total intrinsic value for options exercised		$ 40,000	$ 45,200	$ 287,800
Cash received from option exercises		38,600	31,600	80,300
Tax benefit realized from stock option exercises		$ 4,900	18,400	11,400
Share price		$ 253.69
Total fair value of shares vested		$ 8,700	15,900	22,700
Non-cash compensation expense		87,919	99,909	84,402
Non-cash compensation capitalized to fixed and intangible assets		1,700	1,900	1,400
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock options		$ 1,600
Weighted average period to recognize cost		4 years
Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period		3 years
2018 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for future issuance under the plan		157,697
Non-cash compensation expense		$ 1,000	$ 1,200	$ 1,100
2018 Plan [Member] | Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares remaining available for future issuance under the plan	300,000
Percentage of purchase plan price per share equal to the fair market value	85.00%
Class A common stock issued under the purchase plan		27,280	24,754
Cash proceeds from issuance of shares under the purchase plan		$ 5,600	$ 6,700
2020 Plan [Member] | Class A Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum issuance of shares					3,000,000.0
Shares remaining available for future issuance under the plan		2,200,000
Minimum [Member] | Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metric, target amount, percentage		0.00%
Maximum [Member] | Performance Stock Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance metric, target amount, percentage		200.00%