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Income Tax (Tables)
 9 Months Ended
Sep. 30, 2016
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% to pre-tax income as a result of the following for the three and nine months ended September 30, 2016 and 2015 (dollars in thousands):
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2016
 
2015
 
2016
 
2015
Tax provision at U.S. statutory rate
 
$
100,660

 
$
49,048

 
$
261,941

 
$
188,318

Increase (decrease) in income taxes resulting from:
 
 
 
 
 
 
 
 
Foreign tax rate differing from U.S. tax rate
 
(2,335
)
 
(96
)
 
(14,617
)
 
(5,685
)
Differences in tax bases in foreign jurisdictions
 
(7,078
)
 
(16,221
)
 
(21,567
)
 
(29,822
)
Deferred tax valuation allowance
 
4,411

 
10,239

 
13,698

 
21,997

Amounts related to tax audit contingencies
 
(3,979
)
 
(2,580
)
 
(175
)
 
(675
)
Corporate rate changes
 
—

 
—

 
—

 
58

Subpart F
 
1,779

 
12,188

 
3,212

 
30,074

Foreign tax credits
 
(1,934
)
 
(1,106
)
 
(2,655
)
 
(4,554
)
Return to provision adjustments
 
(1,996
)
 
3,747

 
(2,227
)
 
(1,774
)
Other, net
 
(647
)
 
1,384

 
(501
)
 
1,076

Total provision for income taxes
 
$
88,881

 
$
56,603

 
$
237,109

 
$
199,013

Effective tax rate
 
30.9
%
 
40.4
%
 
31.7
%
 
37.0
%