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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2017
Stockholders' Equity [Abstract] |
Schedule of Treasury Stock by Class [Table Text Block] | The activity in connection with common shares held in treasury by the Company for the quarters ended March 31, 2017 and 2016 is set forth below
| Quarter Ended March 31,
| 2017 |  | 2016
|  |  | Dollar |  |  |  | Dollar
| Shares |  | Amount |  | Shares |  | Amount
| (In thousands, except shares data)
Beginning of period | 8,711,025 |  | $ | 104,860 |  | 8,757,960 |  | $ | 105,379
Common shares used upon lapse of restricted stock units | (32,598) |  |  | (358) |  | (45,810) |  |  | (505)
End of period | 8,678,427 |  | $ | 104,502 |  | 8,712,150 |  | $ | 104,874

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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://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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