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Shareholders' Equity Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Schedule of Stockholders Equity [Table Text Block] | On July 21, 2016, our Board of Directors approved a stock repurchase authorization for up to three million shares of the Company’s common stock. The following table summarizes our share repurchases for the three and six months ended June 30, 2018 and 2017.
| Three months ended |  | Six months ended
| June 30, 2018 |  |  | June 30, 2017 |  |  | June 30, 2018 |  |  | June 30, 2017 |
Shares repurchased | 132,880 |  |  | 42,055 |  |  | 497,166 |  |  | 246,864 |
Cost of shares repurchased | $ | 8,172 |  |  | $ | 1,999 |  |  | $ | 28,165 |  |  | $ | 11,995 |
Average cost per share | $ | 61.50 |  |  | $ | 47.54 |  |  | $ | 56.65 |  |  | $ | 48.59 |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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