Stock-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	May 23, 2018	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	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		$ 19,500	$ 40,000	$ 45,200
Cash received from option exercises		29,400	38,600	31,600
Tax benefit realized from stock option exercises		$ 1,500	(4,900)	(18,400)
Share price		$ 203.80
Total fair value of shares vested		$ 400	8,700	15,900
Non-cash compensation expense		74,374	87,919	99,909
Non-cash compensation capitalized to fixed assets		1,600	1,700	1,900
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized compensation cost related to unvested stock options		$ 1,200
Weighted average period to recognize cost		3 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		121,022
Non-cash compensation expense		$ 1,200	$ 1,000	$ 1,200
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		36,675	27,280
Cash proceeds from issuance of shares under the purchase plan		$ 6,600	$ 5,600
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		1,900,000
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%