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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2017
Income Tax Disclosure [Abstract]  
Income tax expense (benefit)
The Company’s income tax expense consisted of the following:

 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
 
2017
 
2016
 
2017
 
2016
Income before provision for income taxes
$
26,950

 
$
39,023

 
$
70,316

 
$
121,119

Income tax expense using estimated annual effective income tax rate
10,331

 
15,306

 
26,961

 
47,474

Changes in effective tax rates
173

 
(1,149
)
 
—

 
—

Impact of discrete items, net
(4,032
)
 
(841
)
 
(4,444
)
 
(792
)
Income tax expense
$
6,472

 
$
13,316

 
$
22,517

 
$
46,682