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Income Tax (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
three and six months ended June 30, 2018 and 2017, respectively (dollars in thousands):
 
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2018
 
2017
 
2018
 
2017
Tax provision at U.S. statutory rate
 
$
51,931

 
$
118,760

 
$
80,895

 
$
191,506

Increase (decrease) in income taxes resulting from:
 
 
 
 
 
 
 
 
U.S. Tax Reform provisional adjustments
 
(4,314
)
 
—

 
(3,539
)
 
—

Foreign tax rate differing from U.S. tax rate
 
(330
)
 
(4,261
)
 
1,103

 
(10,413
)
Differences in tax bases in foreign jurisdictions
 
(1,132
)
 
(13,375
)
 
(6,892
)
 
(16,759
)
Deferred tax valuation allowance
 
3,079

 
13,031

 
10,501

 
14,213

Amounts related to tax audit contingencies
 
(2,036
)
 
(1,783
)
 
(1,201
)
 
(1,172
)
Corporate rate changes
 
145

 
44

 
417

 
(1,193
)
Subpart F
 
(348
)
 
1,140

 
310

 
1,326

Foreign tax credits
 
113

 
(1,938
)
 
(459
)
 
(2,064
)
Global intangible low-taxed income, net of credit
 
(119
)
 
—

 
4,291

 
—

Equity compensation excess benefit
 
(3,135
)
 
(2,609
)
 
(4,250
)
 
(4,464
)
Return to provision adjustments
 
(503
)
 
(633
)
 
(139
)
 
(403
)
Other, net
 
(437
)
 
(1,251
)
 
(428
)
 
(1,120
)
Total provision for income taxes
 
$
42,914

 
$
107,125

 
$
80,609

 
$
169,457

Effective tax rate
 
17.4
%
 
31.6
%
 
20.9
%
 
31.0
%