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Income Tax (Tables)
 9 Months Ended
Sep. 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 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
%