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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2018
Income Tax Disclosure [Abstract]  
Summary of Effective Income Tax Rate
The effective income tax rate differed from the expected rate as shown below:
 
Three Months Ended March 31,
 
2018
 
%
 
2017
 
%
Expected income taxes
$
44,697

 
21.0

 
$
67,109

 
35.0

Increase (reduction) in income taxes resulting from:
 
 
 
 
 
 
 
Low income housing investments
(3,325
)
 
(1.6
)
 
(4,649
)
 
(2.4
)
Share-based awards
(2,199
)
 
(1.0
)
 
(5,673
)
 
(3.0
)
Other
(42
)
 
—

 
(2,224
)
 
(1.2
)
Income tax expense (benefit) from continuing operations
$
39,131

 
18.4

 
$
54,563

 
28.4