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Stockholders' Equity Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Stockholders' Equity Note [Abstract] |
Schedule of Share Repurchases | Our repurchase activity is as follows:
| Six months ended June 30, |  | Inception to date
| 2018 | 2017 |
Program | Shares | Total $ | $ per share | Shares | Total $ | $ per share |  | Shares | Total $ | $ per share
Open market | 104,155 |  | $ | 3,427,879 |  | $ | 32.91 |  | 8,676 |  | $ | 283,654 |  | $ | 32.69 |  |  | 3,947,650 |  | $ | 64,659,994 |  | $ | 16.38 |
401(k) | 231,387 |  | 8,108,190 |  | 35.04 |  | 258,051 |  | 9,083,606 |  | 35.20 |  |  | 6,781,410 |  | 90,176,995 |  | 13.30 |
Directors and employees | 23,140 |  | 810,505 |  | 35.03 |  | 30,158 |  | 1,066,450 |  | 35.36 |  |  | 1,942,650 |  | 18,088,538 |  | 9.31 |
Total | 358,682 |  | $ | 12,346,574 |  | $ | 34.42 |  | 296,885 |  | $ | 10,433,710 |  | $ | 35.14 |  |  | 12,671,710 |  | $ | 172,925,527 |  | $ | 13.65 |
Schedule of Dividends Payable | Our recent dividends are as follows:
Declaration Date | Record Date | Payment Date | Dividend per Share
May 16, 2017 | June 9, 2017 | July 7, 2017 | $ | 0.13 |
November 7, 2017 | November 30, 2017 | December 21, 2017 | $ | 0.13 |
May 18, 2018 | June 8, 2018 | July 6, 2018 | $ | 0.16 |

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- Definition Tabular disclosure of all or some of the information related to dividends declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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