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Income Tax Income Tax (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2015 and 2014 (dollars in thousands):
 
 
Three months ended June 30,
 
Six months ended June 30,
 
 
2015
 
2014
 
2015
 
2014
Tax provision at U.S. statutory rate
 
$
74,826

 
$
105,187

 
$
139,270

 
$
174,991

Increase (decrease) in income taxes resulting from:
 
 
 
 
 
 
 
 
Foreign tax rate differing from U.S. tax rate
 
(764
)
 
(4,676
)
 
(6,285
)
 
(7,896
)
Differences in tax bases in foreign jurisdictions
 
(6,931
)
 
(3,564
)
 
(13,601
)
 
(3,314
)
Deferred tax valuation allowance
 
4,967

 
2,510

 
11,758

 
(647
)
Amounts related to tax audit contingencies
 
952

 
778

 
1,905

 
1,556

Subpart F
 
11,452

 
3,691

 
17,886

 
6,129

Foreign tax credits
 
(1,104
)
 
(1,155
)
 
(3,448
)
 
(2,010
)
Return to provision adjustments
 
(212
)
 
114

 
(4,977
)
 
(3,237
)
Other, net
 
213

 
(646
)
 
(98
)
 
(557
)
Total provision for income taxes
 
$
83,399

 
$
102,239

 
$
142,410

 
$
165,015

Effective tax rate
 
39.0
%
 
34.0
%
 
35.8
%
 
33.0
%