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Income Tax
 9 Months Ended
Sep. 30, 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 35.0% to pre-tax income as a result of the following for the three and nine months ended September 30, 2017 and 2016 (dollars in thousands):
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2017
 
2016
 
2017
 
2016
Tax provision at U.S. statutory rate
 
$
119,057

 
$
100,660

 
$
310,562

 
$
261,941

Increase (decrease) in income taxes resulting from:
 
 
 
 
 
 
 
 
Foreign tax rate differing from U.S. tax rate
 
(3,635
)
 
(2,335
)
 
(14,049
)
 
(14,617
)
Differences in tax bases in foreign jurisdictions
 
2,126

 
(7,078
)
 
(14,633
)
 
(21,567
)
Deferred tax valuation allowance
 
(2,501
)
 
4,411

 
11,627

 
13,698

Amounts related to tax audit contingencies
 
299

 
(3,979
)
 
(873
)
 
(175
)
Corporate rate changes
 
(1,139
)
 
—

 
(2,332
)
 
—

Subpart F
 
64

 
1,779

 
1,390

 
3,212

Foreign tax credits
 
1,230

 
(1,934
)
 
(834
)
 
(2,655
)
Equity compensation excess benefit
 
(2,762
)
 
—

 
(7,226
)
 
—

Return to provision adjustments
 
452

 
(1,996
)
 
133

 
(2,227
)
Other, net
 
(620
)
 
(647
)
 
(1,737
)
 
(501
)
Total provision for income taxes
 
$
112,571

 
$
88,881

 
$
282,028

 
$
237,109

Effective tax rate
 
33.1
%
 
30.9
%
 
31.8
%
 
31.7
%

The effective tax rate for the third quarter of 2017 was lower than the U.S. Statutory rate of 35.0% primarily as a result of income generated in non-U.S. jurisdictions with lower tax rates than the U.S. The first nine months of 2017 also includes a reduction related to differences in tax bases in foreign jurisdictions and a tax benefit from the filing of amended returns, which was partially offset with a valuation allowance established related to amended return filings. The third quarter of 2016 effective tax rate was lower than the U.S. Statutory rate of 35.0% primarily as a result of effectively settling an uncertain tax position during the quarter and adjustments related to the filing of the US Federal Income tax return. The first nine months of 2016 effective tax rate 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.