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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% |  |  |

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