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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of Quarterly Financial Information The following table provides quarterly information for the years ended December 31, 2018 and 2017 (in thousands, except per share amounts):
 
Three Months Ended
 
March 31
 
June 30
 
September 30
 
December 31
2018
 
 
 
 
 
 
 
Revenue
$
346,293

 
$
358,624

 
$
355,452

 
$
357,984

Gross profit
100,188

 
107,483

 
104,381

 
106,556

Net income
9,175

 
16,272

 
16,177

 
16,356

Earnings per share-basic
$
0.37

 
$
0.66

 
$
0.65

 
$
0.66

Earnings per share-diluted
$
0.37

 
$
0.65

 
$
0.64

 
$
0.65

2017
 
 
 
 
 
 
 
Revenue
$
333,992

 
$
340,309

 
$
341,053

 
$
342,586

Gross profit
97,135

 
103,919

 
104,375

 
102,627

Net income
5,902

 
11,144

 
10,099

 
6,140

Earnings per share-basic
$
0.23

 
$
0.44

 
$
0.40

 
$
0.25

Earnings per share-diluted
$
0.23

 
$
0.44

 
$
0.40

 
$
0.24