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Income Taxes Tax Rate (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | A reconciliation of the differences between the effective tax rate and the federal statutory tax rate for the years ended December 31 is as follows:
| 2017 |  | 2016 |  | 2015
Federal statutory tax rate | 35.0% |  | 35.0% |  | 35.0%
State income taxes, net of federal income tax benefit | 3.8 |  | 3.9 |  | 3.9
Non-deductible employee stock purchase plan expense | 0.3 |  | 0.3 |  | 0.3
Non-deductible meals and entertainment | 0.3 |  | 0.3 |  | 0.3
Tax Reform Act deferred tax revaluation and transition tax impact | (26.9) |  | — |  | —
Other, net | (1.4) |  | (0.3) |  | 0.1
Effective tax rate | 11.1% |  | 39.2% |  | 39.6%

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 + Details
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