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Federal and State Income Taxes Federal and State Income Taes (Tables) | 6 Months Ended
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Jun. 30, 2018
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | The reconciliations of income attributable to continuing operations at the U.S. federal statutory tax rate to income tax expense are as follows (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Amount: |  |  |  |  |  |  |
Federal statutory tax | $ | 31,182 |  |  | $ | 47,800 |  |  | $ | 59,804 |  |  | $ | 92,168 |
Tax exempt revenue | (1,653 | ) |  | (3,224 | ) |  | (3,465 | ) |  | (6,335 | )
Effect of state income taxes, net of federal benefit | 3,288 |  |  | 2,944 |  |  | 6,945 |  |  | 5,389 |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments | (1,334 | ) |  | (889 | ) |  | (2,667 | ) |  | (2,976 | )
Share-based compensation | (424 | ) |  | 1,636 |  |  | (2,044 | ) |  | (2,301 | )
Adjustment to provisional amounts related to tax reform | — |  |  | — |  |  | 1,895 |  |  | — |
Other, net | 2,271 |  |  | (562 | ) |  | 3,810 |  |  | (137 | )
Total income tax expense | $ | 33,330 |  |  | $ | 47,705 |  |  | $ | 64,278 |  |  | $ | 85,808 |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Percent of pretax income: |  |  |  |  |  |  |
Federal statutory tax | 21.0 | % |  | 35.0 | % |  | 21.0 | % |  | 35.0 | %
Tax exempt revenue | (1.1 | ) |  | (2.4 | ) |  | (1.2 | ) |  | (2.4 | )
Effect of state income taxes, net of federal benefit | 2.2 |  |  | 2.2 |  |  | 2.4 |  |  | 2.0 |
Utilization of tax credits, net of proportional amortization of low-income housing limited partnership investments | (0.9 | ) |  | (0.7 | ) |  | (0.9 | ) |  | (1.1 | )
Share-based compensation | (0.3 | ) |  | 1.2 |  |  | (0.7 | ) |  | (0.9 | )
Adjustment to provisional amounts related to tax reform | — |  |  | — |  |  | 0.7 |  |  | — |
Other, net | 1.5 |  |  | (0.4 | ) |  | 1.3 |  |  | — |
Total | 22.4 | % |  | 34.9 | % |  | 22.6 | % |  | 32.6 | %

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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=84230637&loc=d3e32687-109319 + Details
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