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Stockholders' Equity (Activity of Common Shares Held in Treasury) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020
Stockholders' Equity Note [Abstract] |  |
Beginning of period | 8,498,163 | 8,486,278
Common shares used upon lapse of restricted stock units and options (Shares) | (273,436) | (118,276)
Common shares repurchased as part of the stock repurchase program (Shares) | 0 | 175,000
End of period | 8,224,727 | 8,543,002
Beginning of period | $ 102,949 | $ 102,339
Common shares used upon lapse of restricted stock units and options (Value) | (2,230) | (1,444)
Common shares repurchased as part of the stock repurchase program (Value) | 0 | 2,226
End of period | $ 100,719 | $ 103,121

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- Definition Equity impact of treasury stocks used for the exercise of restricted stock options granted to employees. + References No definition available. + Details
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- Definition Number of non-option equity instruments exercised by participants. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Cost basis for treasury stock acquired for purposes other than retirement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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- Definition Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29,30) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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