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Income Tax | 6 Months Ended
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Jun. 30, 2019
Income Tax Disclosure [Abstract] |
Income Tax Disclosure [Text Block] | Income Tax The provision for income tax expense differed from the amounts computed by applying the U.S. federal income tax statutory rate of 21.0% to pre-tax income as a result of the following for the three and six months ended June 30, 2019 and 2018, respectively (dollars in thousands):
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Tax provision at U.S. statutory rate |  | $ | 54,616 |  |  | $ | 51,931 |  |  | $ | 100,095 |  |  | $ | 80,895 |
Increase (decrease) in income taxes resulting from: |  |  |  |  |  |  |  |
U.S. Tax Reform provisional adjustments |  | — |  |  | (4,314 | ) |  | — |  |  | (3,539 | )
Foreign tax rate differing from U.S. tax rate |  | 627 |  |  | (330 | ) |  | 1,292 |  |  | 1,103 |
Differences in tax bases in foreign jurisdictions |  | (5,997 | ) |  | (1,132 | ) |  | (21,076 | ) |  | (6,892 | )
Deferred tax valuation allowance |  | 4,662 |  |  | 3,079 |  |  | 23,207 |  |  | 10,501 |
Amounts related to tax audit contingencies |  | 2,404 |  |  | (2,036 | ) |  | 2,964 |  |  | (1,201 | )
Corporate rate changes |  | 94 |  |  | 145 |  |  | (1,737 | ) |  | 417 |
Subpart F |  | 301 |  |  | (348 | ) |  | 466 |  |  | 310 |
Foreign tax credits |  | (415 | ) |  | 113 |  |  | (107 | ) |  | (459 | )
Global intangible low-taxed income, net of credit |  | — |  |  | (119 | ) |  | — |  |  | 4,291 |
Equity compensation excess benefit |  | (3,694 | ) |  | (3,135 | ) |  | (5,155 | ) |  | (4,250 | )
Return to provision adjustments |  | 3,376 |  |  | (503 | ) |  | 3,596 |  |  | (139 | )
Other, net |  | 1,405 |  |  | (437 | ) |  | 891 |  |  | (428 | )
Total provision for income taxes |  | $ | 57,379 |  |  | $ | 42,914 |  |  | $ | 104,436 |  |  | $ | 80,609 |
Effective tax rate |  | 22.1 | % |  | 17.4 | % |  | 21.9 | % |  | 20.9 | %
The effective tax rates for the second quarter and first six months of 2019 were higher than the U.S. Statutory rate of 21.0% primarily as a result of valuation allowances established on losses in foreign jurisdictions, accrual of uncertain tax positions, and return to provision adjustments. These expenses were partially offset by benefits from differences in bases in foreign jurisdictions and excess tax benefits related to equity compensation. The effective tax rates for the second quarter and first six months of 2018 were lower than the U.S. Statutory rate of 21.0% primarily as a result of U.S. Tax Reform related adjustments, the effective settlement of an uncertain tax position, benefits from differences in bases in foreign jurisdictions and excess tax benefits related to equity compensation. These benefits were partially offset by valuation allowances established on losses in foreign jurisdictions.

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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