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Summary of Unaudited Quarterly Results of Operations
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Summary of Unaudited Quarterly Results of Operations
Summary of Unaudited Quarterly Results of Operations

Unaudited quarterly results of operations for the years ended December 31, 2016 and 2015 are summarized below:
 
(Dollars in thousands, except per share data)
 
2016 Quarter Ended
 
Dec. 31
 
Sep. 30
 
Jun. 30
 
Mar. 31
Net sales
$
67,315

 
$
70,199

 
$
69,348

 
$
69,711

Gross profit
$
40,504

 
$
42,573

 
$
42,526

 
$
42,459

Net income (loss)
$
(4,643
)
 
$
1,825

 
$
172

 
$
1,017

 
 
 
 
 
 
 
 
Basic income (loss) per share of common stock (1)
$
(0.53
)
 
$
0.21

 
$
0.02

 
$
0.12

Diluted income (loss) per share of common stock (1)
$
(0.53
)
 
$
0.20

 
$
0.02

 
$
0.11

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(Dollars in thousands, except per share data)
 
2015 Quarter Ended
 
Dec. 31
 
Sep. 30
 
Jun. 30
 
Mar. 31
Net sales
$
64,961

 
$
70,243

 
$
70,726

 
$
69,904

Gross profit
$
39,091

 
$
43,342

 
$
43,808

 
$
42,883

Net income (loss)
$
(3,688
)
 
$
2,430

 
$
2,926

 
$
(1,371
)
 
 
 
 
 
 
 
 
Basic income (loss) per share of common stock (1)
$
(0.42
)
 
$
0.28

 
$
0.34

 
$
(0.16
)
Diluted income (loss) per share of common stock (1)
$
(0.42
)
 
$
0.27

 
$
0.33

 
$
(0.16
)

(1)
The sum of the quarterly earnings per share amounts may not equal the total annual earnings per share due to rounding and the uneven timing of earnings throughout the year compared to the weighted average shares outstanding.