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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
Equity [Abstract] |
Cash Dividends | Cash Dividends — The Company pai d cash dividends during the three months ended March 31, 2018 and 2017 as follows:
2018: | Per Share |  |  | Total |
|  |  |  |  | (in thousands) |
Paid on March 22, 2018 | $ | 0.02 |  |  | $ | 4,443 |
2017: | Per Share |  |  | Total |
|  |  |  |  | (in thousands) |
Paid on March 22, 2017 | $ | 0.02 |  |  | $ | 3,326 |
Treasury Stock Acquisition | Treasury stock acquisitions during the three months ended March 31, 2018 were as follows (dollars in thousands):
| Shares |  |  | Cost |
Treasury shares at beginning of period |  | 43,802,611 |  |  | $ | 918,711 |
Purchases pursuant to stock buyback program |  | 924,800 |  |  |  | 16,928 |
Treasury shares at end of period |  | 44,727,411 |  |  | $ | 935,639 |

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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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