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Federal and State Income Taxes Federal and State Income Taxes | 6 Months Ended
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Jun. 30, 2018
Income Tax Disclosure [Abstract] |
Income Tax Disclosure [Text Block] | Federal and State Income Taxes The Tax Cuts and Jobs Act (the "Act") enacted on December 22, 2017, reduced the federal corporate income tax rate from 35% to 21% beginning January 1, 2018. Provisions of the Act are broad and complex, and we continue to evaluate its effect on the Company's financial statements. Results of this evaluation did not significantly impact the Company's financial position or results of operations for the three and six months ended June 30, 2018. 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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- References No definition available. + Details
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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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