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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2018
Income Tax Disclosure [Abstract]  
Schedule of Income Tax Expense (Benefit)
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
 
 
(in thousands, except percentages)
Income before income taxes
 
$
189,389

 
$
142,267

 
$
90,311

 
$
333,125

Provision for (benefit from) income taxes
 
$
20,865

 
$
8,545

 
$
(67,482
)
 
$
13,757

Effective tax rate
 
11.0
%
 
6.0
%
 
(74.7
)%
 
4.1
%