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Income Tax (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
three and nine months ended September 30, 2018 and 2017, respectively (dollars in thousands):
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2018
 
2017
 
2018
 
2017
Tax provision at U.S. statutory rate
 
$
67,759

 
$
119,057

 
$
148,654

 
$
310,562

Increase (decrease) in income taxes resulting from:
 
 
 
 
 
 
 
 
U.S. Tax Reform provisional adjustments
 
664

 
—

 
(2,685
)
 
—

U.S. Tax Reform valuation allowance adjustments
 
(58,949
)
 
—

 
(59,139
)
 
—

Foreign tax rate differing from U.S. tax rate
 
7,537

 
(3,635
)
 
8,795

 
(14,049
)
Differences in tax bases in foreign jurisdictions
 
(2,371
)
 
2,126

 
(9,264
)
 
(14,633
)
Deferred tax valuation allowance
 
(5,334
)
 
(2,501
)
 
5,357

 
11,627

Amounts related to tax audit contingencies
 
1,851

 
299

 
650

 
(873
)
Corporate rate changes
 
(166
)
 
(1,139
)
 
30

 
(2,332
)
Subpart F
 
(99
)
 
64

 
211

 
1,390

Foreign tax credits
 
(544
)
 
1,230

 
(1,003
)
 
(834
)
Global intangible low-taxed income, net of credit
 
7,624

 
—

 
11,916

 
—

Equity compensation excess benefit
 
(817
)
 
(2,762
)
 
(5,067
)
 
(7,226
)
Return to provision adjustments
 
4,213

 
452

 
4,108

 
133

Other, net
 
94

 
(620
)
 
(492
)
 
(1,737
)
Total provision for income taxes
 
$
21,462

 
$
112,571

 
$
102,071

 
$
282,028

Effective tax rate
 
6.7
%
 
33.1
%
 
14.4
%
 
31.8
%