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Unaudited Quarterly Financial Data Unaudited Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Schedule of quarterly results of operations
The following tables summarize the consolidated quarterly results of operations for 2018 and 2017:
 
 
2018
(in thousands, except per share amounts)
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Net sales
 
$
834,202

 
$
998,461

 
$
990,264

 
$
859,521

Gross profit
 
199,084

 
239,599

 
241,303

 
229,230

Net income
 
15,359

 
40,405

 
35,858

 
28,116

Basic income per share
 
$
0.23

 
$
0.60

 
$
0.53

 
$
0.42

Diluted income per share
 
$
0.23

 
$
0.60

 
$
0.53

 
$
0.41



 
 
2017
(in thousands, except per share amounts)
 
First
Quarter
 
Second
Quarter
 
Third
Quarter
 
Fourth
Quarter
Net sales
 
$
757,700

 
$
886,375

 
$
881,012

 
$
840,881

Gross profit
 
178,197

 
211,687

 
209,545

 
196,086

Net income
 
3,744

 
17,596

 
18,443

 
17,642

Basic income per share
 
$
0.06

 
$
0.26

 
$
0.28

 
$
0.26

Diluted income per share
 
$
0.06

 
$
0.26

 
$
0.27

 
$
0.26