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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Equity [Abstract] |
Cash Dividends | Cash Dividends – The Company paid cash dividends during the years ended December 31, 2018, 2017 and 2016 as follows:
|  | Per Share |  |  | Total |
|  |  |  |  |  | (in thousands) |
2018 |  |  |  |  |  |  |  |
Paid on March 22, 2018 |  | $ | 0.02 |  |  | $ | 4,443 |
Paid on June 21, 2018 |  |  | 0.04 |  |  |  | 8,832 |
Paid on September 20, 2018 |  |  | 0.04 |  |  |  | 8,685 |
Paid on December 20, 2018 |  |  | 0.04 |  |  |  | 8,629 |
Total cash dividends |  | $ | 0.14 |  |  | $ | 30,589 |
2017 |  |  |  |  |  |  |  |
Paid on March 22, 2017 |  | $ | 0.02 |  |  | $ | 3,326 |
Paid on June 22, 2017 |  |  | 0.02 |  |  |  | 4,269 |
Paid on September 21, 2017 |  |  | 0.02 |  |  |  | 4,271 |
Paid on December 21, 2017 |  |  | 0.02 |  |  |  | 4,449 |
Total cash dividends |  | $ | 0.08 |  |  | $ | 16,315 |
2016 |  |  |  |  |  |  |  |
Paid on March 24, 2016 |  | $ | 0.10 |  |  | $ | 14,712 |
Paid on June 23, 2016 |  |  | 0.02 |  |  |  | 2,953 |
Paid on September 22, 2016 |  |  | 0.02 |  |  |  | 2,953 |
Paid on December 22, 2016 |  |  | 0.02 |  |  |  | 2,961 |
Total cash dividends |  | $ | 0.16 |  |  | $ | 23,579 |
Treasury Stock Acquisition | Treasury stock acquisitions during the years ended December 31, 2018, 2017 and 2016 were as follows (dollars in thousands):
|  | 2018 |  |  | 2017 |  |  | 2016 |
|  | Shares |  |  | Cost |  |  | Shares |  |  | Cost |  |  | Shares |  |  | Cost |
Treasury shares at beginning of period |  |  | 43,802,611 |  |  | $ | 918,711 |  |  |  | 43,392,617 |  |  | $ | 911,094 |  |  |  | 43,207,240 |  |  | $ | 907,045 |
Purchases pursuant to stock buyback program |  |  | 9,331,131 |  |  |  | 150,497 |  |  |  | 5,503 |  |  |  | 109 |  |  |  | 8,488 |  |  |  | 183 |
Acquisitions pursuant to long-term incentive plan |  |  | 567,354 |  |  |  | 11,240 |  |  |  | 404,491 |  |  |  | 7,508 |  |  |  | 176,889 |  |  |  | 3,866 |
Treasury shares at end of period |  |  | 53,701,096 |  |  | $ | 1,080,448 |  |  |  | 43,802,611 |  |  | $ | 918,711 |  |  |  | 43,392,617 |  |  | $ | 911,094 |

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