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Stockholders' Equity - Number of Shares (Details) - shares shares in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Reconciliation of the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share |  |  |  |
Common shares outstanding, end of period | 35,281 | 35,691 | 35,281 | 35,691
Effect of using weighted average common shares outstanding | 26 | 55 | 134 | 51
Shares used in computing earnings per share-basic | 35,307 | 35,746 | 35,415 | 35,742
Effect of shares issuable under stock option plans based on the treasury stock method | 21 | 30 | 24 | 30
Effect of restricted and contingently issuable shares | 41 | 52 | 47 | 56
Shares used in computing earnings per share-diluted | 35,369 | 35,828 | 35,486 | 35,828

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