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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2016
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 six-month periods ended June 30, 2016 and 2015 is set forth below
| Six-Month Period Ended June 30
| 2016 |  | 2015 |
|  |  | Dollar |  |  |  | Dollar |
| Shares |  | Amount |  | Shares |  | Amount |
| (In thousands, except shares data)
Beginning of period | 8,757,960 |  | $ | 105,379 |  | 8,012,254 |  | $ | 97,070 |
Common shares used upon lapse of restricted stock units | (45,810) |  |  | (505) |  | (58,279) |  |  | (640) |
Common shares repurchased as part of the stock repurchase program | - |  |  | - |  | 303,985 |  |  | 4,238 |
End of period | 8,712,150 |  | $ | 104,874 |  | 8,257,960 |  | $ | 100,668 |

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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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