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Income Tax (Tables) | 6 Months Ended
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Jun. 30, 2017
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | Provision for income tax expense differed from the amounts computed by applying the U.S. federal income tax statutory rate of 35.0% to pre-tax income as a result of the following for the three and six months ended June 30, 2017 and 2016 (dollars in thousands):
|  | Three months ended June 30, |  | Six months ended June 30,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Tax provision at U.S. statutory rate |  | $ | 118,760 |  |  | $ | 123,628 |  |  | $ | 191,506 |  |  | $ | 161,281 |
Increase (decrease) in income taxes resulting from: |  |  |  |  |  |  |  |
Foreign tax rate differing from U.S. tax rate |  | (4,261 | ) |  | (8,398 | ) |  | (10,413 | ) |  | (12,282 | )
Differences in tax bases in foreign jurisdictions |  | (13,375 | ) |  | (5,553 | ) |  | (16,759 | ) |  | (14,489 | )
Deferred tax valuation allowance |  | 13,031 |  |  | 4,288 |  |  | 14,213 |  |  | 9,287 |
Amounts related to tax audit contingencies |  | (1,783 | ) |  | 3,288 |  |  | (1,172 | ) |  | 3,889 |
Corporate rate changes |  | 44 |  |  | — |  |  | (1,193 | ) |  | — |
Subpart F |  | 1,140 |  |  | 738 |  |  | 1,326 |  |  | 1,433 |
Foreign tax credits |  | (1,938 | ) |  | (427 | ) |  | (2,064 | ) |  | (721 | )
Equity compensation excess benefit |  | (2,609 | ) |  | — |  |  | (4,464 | ) |  | — |
Return to provision adjustments |  | (633 | ) |  | (442 | ) |  | (403 | ) |  | (316 | )
Other, net |  | (1,251 | ) |  | (2 | ) |  | (1,120 | ) |  | 146 |
Total provision for income taxes |  | $ | 107,125 |  |  | $ | 117,120 |  |  | $ | 169,457 |  |  | $ | 148,228 |
Effective tax rate |  | 31.6 | % |  | 33.2 | % |  | 31.0 | % |  | 32.2 | %

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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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