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Income Tax (Tables) | 3 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | for the three months ended March 31, 2018 and 2017, respectively (dollars in thousands):
|  | Three months ended March 31,
|  | 2018 |  | 2017
Tax provision at U.S. statutory rate |  | $ | 28,964 |  |  | $ | 72,745 |
Increase (decrease) in income taxes resulting from: |  |  |  |
U.S. Tax Reform provisional adjustments |  | 775 |  |  | — |
Foreign tax rate differing from U.S. tax rate |  | 1,432 |  |  | (6,153 | )
Differences in tax bases in foreign jurisdictions |  | (5,760 | ) |  | (3,383 | )
Deferred tax valuation allowance |  | 7,947 |  |  | 1,182 |
Amounts related to tax audit contingencies |  | 835 |  |  | 611 |
Corporate rate changes |  | 111 |  |  | (1,237 | )
Subpart F |  | 658 |  |  | 186 |
Foreign tax credits |  | (572 | ) |  | (126 | )
Global intangible low-taxed income, net of credit |  | 4,409 |  |  | — |
Return to provision adjustments |  | — |  |  | 229 |
Equity compensation excess benefit |  | (1,114 | ) |  | (1,856 | )
Other, net |  | 10 |  |  | 134 |
Total provision for income taxes |  | $ | 37,695 |  |  | $ | 62,332 |
Effective tax rate |  | 27.3 | % |  | 30.0 | %

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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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