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Shareholders' Equity (Narrative) (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 USD ($) classOfCommonStock vote $ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2019 shares
Class of Stock [Line Items] |  |  |
Number of classes of common stock | classOfCommonStock | 2 |  |
Purchase of treasury shares | $ | $ 24,375 |  |
Treasury Stock |  |  |
Class of Stock [Line Items] |  |  |
Purchases of common stock (in shares) | 285,286 |  |
Purchase of treasury shares | $ | $ 24,375 |  |
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, capital shares reserved for future issuance (in shares) |  | 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 |

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