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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2013
Income Tax Disclosure [Abstract]  
Sources of income from continuing operations before income taxes
The sources of income from continuing operations before income taxes for the three and six months ended June 30, 2012 and 2013 were as follows: 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2013
 
2012
 
2013
U.S. operations
$
357

 
$
791

 
$
681

 
$
1,196

Non-U.S. operations
17,313

 
35,795

 
52,520

 
62,038

Total
$
17,670

 
$
36,586

 
$
53,201

 
$
63,234
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 June 30,
 
Six Months Ended June 30,
 
2012
 
2013
 
2012
 
2013
Notional U.S. federal income tax expense (benefit) at the statutory rate
$
6,184

 
$
12,805

 
$
18,620

 
$
22,132

U.S. state and local income tax, net
25

 
52

 
49

 
86

Non-U.S. operations:
 
 
 
 
 
 
 
Bermuda
(2,132
)
 
(8,989
)
 
(10,764
)
 
(12,865
)
Ireland
(1,645
)
 
410

 
(1,675
)
 
(491
)
Other
(1,138
)
 
(635
)
 
(2,058
)
 
(1,729
)
Non-deductible expenses in the U.S.
57

 
97

 
112

 
199

Other
(5
)
 
(8
)
 
(9
)
 
(16
)
Income tax provision (benefit)
$
1,346

 
$
3,732

 
$
4,275

 
$
7,316