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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]  
Sources of income from continuing operations before income taxes
The sources of income (loss) from continuing operations before income taxes for the three and nine months ended September 30, 2011 and 2012 were as follows: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2011
 
2012
 
2011
 
2012
U.S. operations
$
372

 
$
572

 
$
1,195

 
$
1,253

Non-U.S. operations
23,530

 
(44,718
)
 
93,497

 
7,802

Total
$
23,902

 
$
(44,146
)
 
$
94,692

 
$
9,055
Analysis of effective income tax rate for continuing operations
Differences between statutory income tax rates and our effective income tax rates applied to pre-tax income consisted of the following: 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2011
 
2012
 
2011
 
2012
Notional U.S. federal income tax expense (benefit) at the statutory rate
$
8,365

 
$
(15,451
)
 
$
33,142

 
$
3,169

U.S. state and local income tax, net
20

 
37

 
68

 
86

Non-U.S. operations:
 
 
 
 
 
 
 
Bermuda
(3,597
)
 
20,203

 
(19,832
)
 
9,439

Ireland
(1,246
)
 
(2,101
)
 
(4,167
)
 
(3,776
)
Other
(2,097
)
 
(1,051
)
 
(3,740
)
 
(3,109
)
Non-deductible expenses in the U.S.
18

 
71

 
806

 
183

Other
(226
)
 
(7
)
 
(236
)
 
(16
)
Income tax provision (benefit)
$
1,237

 
$
1,701

 
$
6,041

 
$
5,976