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Stockholders' Equity - Number of Shares (Details) - shares shares in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 | 36,188 | 36,658 | 36,894
Effect of using weighted average common shares outstanding | 354 | 196 | 308
Shares used in computing earnings per share-basic | 36,542 | 36,854 | 37,202
Effect of shares issuable under stock option plans based on the treasury stock method | 123 | 204 | 283
Effect of restricted and contingently issuable shares | 73 | 73 | 107
Shares used in computing earnings per share-diluted | 36,738 | 37,131 | 37,592

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