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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Schedule of Stockholders Equity [Table Text Block] | The following tables summarize our share repurchases for the three and six months ended June 30, 2019 and 2018.
| Three months ended
| June 30, 2019 |  | June 30, 2018
| Shares repurchased | Cost of shares repurchased | Average cost per share |  | Shares repurchased | Cost of shares repurchased | Average cost per share
2016 Repurchase Plan | — |  | $ | — |  | $ | — |  |  | 133 |  | $ | 8,172 |  | $ | 61.50 |
2019 Repurchase Plan | 407 |  | 24,436 |  | 60.05 |  |  | — |  | — |  | — |
Total | 407 |  | $ | 24,436 |  | $ | 60.05 |  |  | 133 |  | $ | 8,172 |  | $ | 61.50 |
| Six months ended
| June 30, 2019 |  | June 30, 2018
| Shares repurchased | Cost of shares repurchased | Average cost per share |  | Shares repurchased | Cost of shares repurchased | Average cost per share
2016 Repurchase Plan | 68 |  | $ | 3,850 |  | $ | 56.97 |  |  | 497 |  | $ | 28,165 |  | $ | 56.65 |
2019 Repurchase Plan | 569 |  | 34,767 |  | 61.08 |  |  | — |  | — |  | — |
Total | 637 |  | $ | 38,617 |  | $ | 60.65 |  |  | 497 |  | $ | 28,165 |  | $ | 56.65 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration