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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Income tax expense (benefit) The Company’s income tax expense consisted of the following:

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Income before provision for income taxes
$
31,756

 
$
50,373

 
$
37,368

 
$
43,366

Income tax expense using estimated annual effective income tax rate
14,209

 
19,152

 
16,720

 
16,457

Changes in effective tax rates
455

 
(56
)
 
—

 
—

Change in estimate for the impact of Tax Cuts and Jobs Act of 2017
(1,809
)
 
—

 
(1,809
)
 
—

Impact of discrete items, net
(95
)
 
(269
)
 
(203
)
 
(412
)
Income tax expense
$
12,760

 
$
18,827

 
$
14,708

 
$
16,045