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Income Tax (Tables)
 6 Months Ended
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
%