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Stockholders' Equity - Number of Shares (Details) - shares shares in Thousands | 3 Months Ended
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Mar. 31, 2022 | Mar. 31, 2021
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 | 35,953 | 36,255
Effect of using weighted average common shares outstanding | 123 | 31
Shares used in computing earnings per share-basic | 36,076 | 36,286
Effect of shares issuable under stock option plans based on the treasury stock method | 43 | 131
Effect of restricted and contingently issuable shares | 69 | 82
Shares used in computing earnings per share-diluted | 36,188 | 36,499

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