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Income Tax Income Tax | 3 Months Ended
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Mar. 31, 2017
Income Tax Disclosure [Abstract] |
Income Tax Disclosure [Text Block] | Income Tax Provision for income tax expense differed from the amounts computed by applying the U.S. federal income tax statutory rate of 35% to pre-tax income as a result of the following for the three months ended March 31, 2017 and 2016 (dollars in thousands):
|  | Three months ended March 31,
|  | 2017 |  | 2016
Tax provision at U.S. statutory rate |  | $ | 72,745 |  |  | $ | 37,653 |
Increase (decrease) in income taxes resulting from: |  |  |  |
Foreign tax rate differing from U.S. tax rate |  | (6,153 | ) |  | (3,884 | )
Differences in tax bases in foreign jurisdictions |  | (3,383 | ) |  | (8,935 | )
Deferred tax valuation allowance |  | 1,182 |  |  | 4,999 |
Amounts related to tax audit contingencies |  | 611 |  |  | 602 |
Corporate rate changes |  | (1,237 | ) |  | (65 | )
Subpart F |  | 186 |  |  | 696 |
Foreign tax credits |  | (126 | ) |  | (293 | )
Return to provision adjustments |  | 229 |  |  | 125 |
Equity compensation excess benefit |  | (1,856 | ) |  | — |
Other, net |  | 134 |  |  | 210 |
Total provision for income taxes |  | $ | 62,332 |  |  | $ | 31,108 |
Effective tax rate |  | 30.0 | % |  | 28.9 | %
The effective tax rate for the three months ended March 31, 2017 was lower than the U.S. Statutory rate of 35.0% primarily as a result of income in non-U.S. jurisdictions with lower tax rates than the U.S., and the impact of adopting newly-effective accounting guidance related to stock compensation as of January 1, 2017. As a result of the adoption, the excess tax benefits related to share-based awards are now recorded in income tax expense rather than deferred tax liabilities. See Note 12 - “New Accounting Standards” for additional information. The effective tax rate for the three months ended March 31, 2016 was lower than the U.S. Statutory rate of 35.0% primarily as a result of tax benefits from income in non-U.S. jurisdictions with lower tax rates than the U.S. and differences in tax bases 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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