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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2016
Income Tax Disclosure [Abstract]  
Summary of Effective Income Tax Rate
The effective income tax differed from the expected 35% rate as shown below:
 
Three Months Ended June 30,
 
2016
 
%
 
2015
 
%
Expected income taxes
$
69,770

 
35.0

 
$
68,853

 
35.0

Increase (reduction) in income taxes resulting from:
 
 
 
 
 
 
 
Low income housing investments
(4,829
)
 
(2.4
)
 
(4,724
)
 
(2.4
)
Share-based awards
(4,194
)
 
(2.2
)
 
—

 
—

Other
(697
)
 
(0.4
)
 
67

 
—

Income tax expense from continuing operations
$
60,050

 
30.0

 
$
64,196

 
32.6

 
 
 
 
 
 
 
 
 
Six Months Ended June 30,
 
2016

%

2015

%
Expected income taxes
$
138,177


35.0


$
136,920


35.0

Increase (reduction) in income taxes resulting from:







Low income housing investments
(9,657
)

(2.4
)

(9,447
)

(2.4
)
Share-based awards
(6,166
)
 
(1.6
)
 
—

 
—

Other
(430
)

(0.1
)

422


0.1

Income tax expense from continuing operations
$
121,924

 
30.9

 
$
127,895

 
32.7