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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
Income Tax Disclosure [Abstract]  
Sources of income from continuing operations before income taxes
The sources of income (loss) from continuing operations before income taxes and earnings of our unconsolidated equity method investments for the three and six months ended June 30, 2017 and 2016 were as follows: 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
U.S. operations
$
902

 
$
1,158

 
$
1,498

 
$
1,744

Non-U.S. operations
(9,789
)
 
19,231

 
31,658

 
57,287

Income (loss) from continuing operations before income taxes and earnings of unconsolidated equity method investments
$
(8,887
)
 
$
20,389

 
$
33,156

 
$
59,031
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 from continuing operations consisted of the following:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
Notional U.S. federal income tax expense at the statutory rate
$
(3,110
)
 
$
7,136

 
$
11,605

 
$
20,661

U.S. state and local income tax, net
48

 
78

 
89

 
125

Non-U.S. operations:
 
 
 
 
 
 
 
Bermuda
10,456

 
(1,570
)
 
1,628

 
(10,662
)
Ireland
(796
)
 
194

 
(254
)
 
2,073

Singapore
(4,662
)
 
(2,716
)
 
(7,589
)
 
(4,051
)
Other low tax jurisdictions
(1,487
)
 
(872
)
 
(2,927
)
 
(2,083
)
Non-deductible expenses in the U.S.
55

 
150

 
(194
)
 
285

Other
(9
)
 
(15
)
 
(17
)
 
(24
)
Provision for income taxes
$
495

 
$
2,385

 
$
2,341

 
$
6,324