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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Unaudited quarterly results of operations
The table below summarizes the unaudited quarterly results of operations for the past two years (in thousands, except per share data):

  
Quarter
  
2017
 
2016
  
First
 
Second
 
Third
 
Fourth
 
First
 
Second
 
Third
 
Fourth
Net sales
$
546,441

 
$
988,163

 
$
743,401

 
$
510,183

 
$
515,250

 
$
918,889

 
$
691,429

 
$
445,235

Gross profit
153,621

 
289,664

 
216,606

 
145,398

 
143,023

 
270,736

 
199,551

 
127,777

Net income (1)
22,270

 
94,620

 
48,783

 
25,665

 
16,363

 
85,247

 
44,421

 
2,572

Net income attributable to Pool Corporation (1)
22,281

 
94,903

 
48,783

 
25,665

 
16,371

 
85,435

 
44,534

 
2,615

Earnings per share:
 
 
 
 
 
 
 
 
 

 
 

 
 

 
 

Basic
$
0.54

 
$
2.30

 
$
1.20

 
$
0.64

 
$
0.39

 
$
2.03

 
$
1.06

 
$
0.06

Diluted
$
0.52

 
$
2.21

 
$
1.16

 
$
0.62

 
$
0.38

 
$
1.98

 
$
1.03

 
$
0.06



The sum of basic and diluted earnings per share for each of the quarters may not equal the total basic and diluted earnings per share for the annual periods because of rounding differences and a difference in the way that in-the-money stock options are considered from quarter to quarter. 

(1) 
Our Net income and Net income attributable to Pool Corporation reflect the adoption of ASU 2016-09 for all periods presented in 2017. For additional information related to the adoption of this accounting standard, see Note 1. Our fourth quarter 2017 Net income and Net income attributable to Pool Corporation reflects benefits recorded due to U.S. tax reform. For additional information related to the impact of U.S. tax reform on our financial statements, see Note 7.