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Income Tax Income Tax
 3 Months Ended
Mar. 31, 2015
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 months ended March 31, 2015 and 2014 (dollars in thousands):
 
 
Three months ended March 31,
 
 
2015
 
2014
Tax provision at U.S. statutory rate
 
$
64,444

 
$
69,804

Increase (decrease) in income taxes resulting from:
 
 
 
 
Foreign tax rate differing from U.S. tax rate
 
(5,517
)
 
(3,221
)
Differences in tax bases in foreign jurisdictions
 
(6,670
)
 
250

Deferred tax valuation allowance
 
6,791

 
(3,157
)
Amounts related to tax audit contingencies
 
952

 
778

Corporate rate changes
 
272

 
(17
)
Subpart F
 
6,434

 
2,439

Foreign tax credits
 
(2,343
)
 
(855
)
Return to provision adjustments
 
(4,765
)
 
(3,353
)
Other, net
 
(587
)
 
108

Total provision for income taxes
 
$
59,011

 
$
62,776

Effective tax rate
 
32.1
%
 
31.5
%

The first quarter of 2015 effective tax rate was lower than the U.S. Statutory rate of 35.0% primarily as a result of income in non-U.S. jurisdictions with lower tax rates than the U.S. and differences in tax bases in foreign jurisdictions. The first quarter rate in 2014 was also lower due to the release of a valuation allowance on tax benefits associated with claims experience on certain treaties. These 2015 and 2014 adjustments were partially offset by a tax accrual related to the Active Financing Exception business extender provision that the U.S. Congress did not pass prior to the end of the quarter.