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Shareholders' Equity (Narrative) (Details) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) vote class_of_common_stock $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Oct. 25, 2021 USD ($) | Sep. 30, 2021 shares | Dec. 31, 2020 shares | Dec. 31, 2019 shares
Class of Stock [Line Items] |  |  |  |  |  |
Number of classes of common stock | class_of_common_stock | 2 |  |  |  |  |
Common stock, shares, outstanding (in shares) | 31,100,000 | 32,100,000 |  |  | 32,300,000 |
Stock repurchase program, authorized amount | $ |  | $ 200,000,000 | $ 200,000,000 |  |  |
Purchase of treasury shares | $ | $ 85,065,000 | $ 24,375,000 |  |  |  |
2021 And 2022 Share Purchases |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Treasury stock, common shares (in shares) | 1,308,003 |  |  |  |  |
Purchase of treasury shares | $ | $ 109,400,000 |  |  |  |  |
Treasury Stock, Common |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares, outstanding (in shares) | 9,675,000 | 8,665,000 |  |  |  |
Treasury stock, common shares (in shares) |  |  |  |  | 8,391,000 | 8,409,000
Purchase of treasury shares | $ | $ 85,065,000 | $ 24,375,000 |  |  |  |
Purchases of common stock (in shares) | 1,022,717 | 285,286 |  |  |  |
Common Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of votes entitled to shareholders per share of common stock | vote | 1 |  |  |  |  |
Common stock, par or stated value per share (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  |  |  |
Common stock, shares, issued (in shares) | 40,785,434 | 40,760,577 |  |  |  |
Common stock, capital shares reserved for future issuance (in shares) |  | 1,600,000 |  | 1,600,000 |  |
Common Class A | IPO | Number of Shares Reduced |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, capital shares reserved for future issuance (in shares) |  |  |  |  |  | 1,600,000
Common Class A | Selling Stockholders Public Offering |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 1,600,000 |  |  |  |
Sale of stock, price per share (in dollars per share) | $ / shares |  | $ 75.9656 |  |  |  |
Common Class B |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of votes entitled to shareholders per share of common stock | vote | 10 |  |  |  |  |
Common stock, par or stated value per share (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  |  |  |
Common stock, shares, outstanding (in shares) | 0 | 104 |  |  |  |
Common stock, shares, issued (in shares) | 0 | 104 |  |  |  |

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