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

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- Definition Tabular disclosure of treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 + Details
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