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QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Schedule of quarterly financial data
 
 
First
 
Second
 
Third
 
Fourth
2016
 
 
 
 
 
 
 
 
Net sales
 
$
550,722

 
$
592,418

 
$
567,646

 
$
563,828

Gross profit
 
189,102

 
202,927

 
199,812

 
197,457

Income before income taxes
 
73,182

 
45,758

 
80,296

 
78,152

Net income
 
53,638

 
31,317

 
60,049

 
53,395

Basic earnings per share
 
$
0.77

 
$
0.46

 
$
0.90

 
$
0.81

Diluted earnings per share
 
$
0.76

 
$
0.45

 
$
0.89

 
$
0.81

2015
 
 
 
 
 
 
 
 
Net sales
 
$
657,900

 
$
664,740

 
$
645,166

 
$
567,985

Gross profit
 
220,390

 
225,781

 
198,894

 
196,079

Income (loss) before income taxes
 
92,707

 
94,434

 
(88,526
)
 
71,172

Net income (loss)
 
68,354

 
70,898

 
(60,466
)
 
48,692

Basic earnings (loss) per share
 
$
0.90

 
$
0.95

 
$
(0.82
)
 
$
0.68

Diluted earnings (loss) per share
 
$
0.89

 
$
0.94

 
$
(0.82
)
 
$
0.68