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Income Tax Income Tax (Tables)
 9 Months Ended
Sep. 30, 2015
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, 2015 and 2014 (dollars in thousands):
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2015
 
2014
 
2015
 
2014
Tax provision at U.S. statutory rate
 
$
49,048

 
$
81,135

 
$
188,318

 
$
256,126

Increase (decrease) in income taxes resulting from:
 
 
 
 
 
 
 
 
Foreign tax rate differing from U.S. tax rate
 
(96
)
 
(3,645
)
 
(5,685
)
 
(11,715
)
Differences in tax bases in foreign jurisdictions
 
(16,221
)
 
(413
)
 
(29,822
)
 
(3,727
)
Deferred tax valuation allowance
 
10,239

 
326

 
21,997

 
(322
)
Amounts related to tax audit contingencies
 
(2,580
)
 
(2,083
)
 
(675
)
 
(527
)
Corporate rate changes
 
—

 
(26
)
 
58

 
(386
)
Subpart F
 
12,188

 
4,426

 
30,074

 
10,555

Foreign tax credits
 
(1,106
)
 
(1,558
)
 
(4,554
)
 
(3,568
)
Return to provision adjustments
 
3,747

 
(4,794
)
 
(1,774
)
 
(8,031
)
Other, net
 
1,384

 
451

 
1,076

 
429

Total provision for income taxes
 
$
56,603

 
$
73,819

 
$
199,013

 
$
238,834

Effective tax rate
 
40.4
%
 
31.8
%
 
37.0
%
 
32.6
%