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Stockholders' Equity - Number of Shares (Details) - shares shares in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 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 | 36,891 | 37,088
Effect of using weighted average common shares outstanding | 32 | 104
Shares used in computing earnings per share-basic | 36,923 | 37,192
Effect of shares issuable under stock option plans based on the treasury stock method | 230 | 317
Effect of restricted and contingently issuable shares | 81 | 119
Shares used in computing earnings per share-diluted | 37,234 | 37,628

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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of contingently issuable shares. Contingently issuable shares are those shares that are issuable for little or no cash contingent on certain conditions being met. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 55 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e2626-109256 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 48 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e2538-109256 + Details
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