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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2015
Income Tax Disclosure [Abstract]  
Income Tax Expense
Income tax expense was as follows:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
 
2015
 
2014
 
2015
 
2014
Current income tax expense
$
16,960

 
$
19,665

 
$
49,048

 
$
49,836

Deferred income tax expense (benefit)
(4,830
)
 
(2,784
)
 
(12,234
)
 
(7,318
)
Income tax expense, as reported
$
12,130

 
$
16,881

 
$
36,814

 
$
42,518

 
 
 
 
 
 
 
 
Effective tax rate
13.8
%
 
17.9
%
 
14.3
%
 
17.2
%