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Income Tax Income Tax
 9 Months Ended
Sep. 30, 2014
Income Tax Disclosure [Abstract]  
Income Tax Disclosure [Text Block]
Income Tax
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, 2014 and 2013 (dollars in thousands):
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2014
 
2013
 
2014
 
2013
Tax provision at U.S. statutory rate
 
$
81,135

 
$
70,593

 
$
256,126

 
$
142,017

Increase (decrease) in income taxes resulting from:
 
 
 
 
 
 
 
 
Foreign tax rate differing from U.S. tax rate
 
(3,645
)
 
(4,562
)
 
(11,715
)
 
(6,603
)
Differences in tax basis in foreign jurisdictions
 
(413
)
 
12,508

 
(3,727
)
 
1,302

Deferred tax valuation allowance
 
326

 
(9,850
)
 
(322
)
 
478

Amounts related to tax audit contingencies
 
(2,083
)
 
1,054

 
(527
)
 
1,946

Corporate rate changes
 
(26
)
 
(925
)
 
(386
)
 
(645
)
Subpart F
 
4,426

 
(3,060
)
 
10,555

 
3,226

Foreign tax credits
 
(1,558
)
 
3,344

 
(3,568
)
 
(172
)
Return to provision adjustments
 
(4,794
)
 
(5,265
)
 
(8,031
)
 
(9,377
)
Other, net
 
451

 
(97
)
 
429

 
(286
)
Total provision for income taxes
 
$
73,819

 
$
63,740

 
$
238,834

 
$
131,886

Effective tax rate
 
31.8
%
 
31.6
%
 
32.6
%
 
32.5
%