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Quarterly results of operations (unaudited)
 12 Months Ended
Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]  
Quarterly results of operations
Quarterly results of operations (unaudited)
The following tables summarize the Company's results by quarter for the years ended December 31, 2016 and 2015. The quarterly results may not be comparable primarily due to acquisitions in 2016, 2015 and 2014. Refer to Note 3, Acquisitions, for further information.
  
2016
(in thousands, except per share information)
Q1
 
Q2
 
Q3
 
Q4
Net sales
$
159,441

 
$
142,723

 
$
138,268

 
$
147,203

Cost of sales
124,884

 
137,442

 
108,984

 
116,590

Gross profit
34,557

 
5,281

 
29,284

 
30,613

Total operating expenses
60,147

 
58,375

 
55,920

 
56,069

Earnings from equity investment
577

 
216

 
414

 
617

Operating income (loss)
(25,013
)
 
(52,878
)
 
(26,222
)
 
(24,839
)
Total other expense
8,341

 
(3,229
)
 
3,594

 
341

Income (loss) before income taxes
(33,354
)
 
(49,649
)
 
(29,816
)
 
(25,180
)
Provision for income tax expense (benefit)
(10,406
)
 
(21,147
)
 
(11,821
)
 
(12,677
)
Net income (loss)
(22,948
)
 
(28,502
)
 
(17,995
)
 
(12,503
)
Less: loss attributable to noncontrolling interest
(5
)
 
35

 
(6
)
 
6

Net income (loss) attributable to common stockholders
$
(22,943
)
 
$
(28,537
)
 
$
(17,989
)
 
$
(12,509
)
 
 
 
 
 
 
 
 
Weighted average shares outstanding
 
 
 
 
 
 
 
Basic
90,477

 
90,707

 
90,860

 
91,923

Diluted
90,477

 
90,707

 
90,860

 
91,923

Earnings (loss) per share
 
 
 
 
 
 
 
Basic
$
(0.25
)
 
$
(0.31
)
 
$
(0.20
)
 
$
(0.14
)
Diluted
$
(0.25
)
 
$
(0.31
)
 
$
(0.20
)
 
$
(0.14
)

  
2015
(in thousands, except per share information)
Q1
 
Q2
 
Q3
 
Q4
Net sales
$
348,096

 
$
284,415

 
$
244,993

 
$
196,148

Cost of sales
238,970

 
199,532

 
179,231

 
193,242

Gross profit
109,126

 
84,883

 
65,762

 
2,906

Total operating expenses (1)
73,465

 
66,285

 
57,439

 
194,035

Earnings from equity investment
4,571

 
3,840

 
3,870

 
2,543

Operating income (loss)
40,232

 
22,438

 
12,193

 
(188,586
)
Total other expense
971

 
11,662

 
4,543

 
3,424

Income (loss) before income taxes
39,261

 
10,776

 
7,650

 
(192,010
)
Provision (benefit) for income tax expense
10,605

 
1,911

 
932

 
(28,387
)
Net income (loss)
28,656

 
8,865

 
6,718

 
(163,623
)
Less: Income (loss) attributable to noncontrolling interest
(16
)
 
(9
)
 
(2
)
 
(4
)
Net income (loss) attributable to common stockholders
$
28,672

 
$
8,874

 
$
6,720

 
$
(163,619
)
 
 
 
 
 
 
 
 
Weighted average shares outstanding
 
 
 
 
 
 
 
Basic
89,482

 
89,767

 
90,058

 
90,175

Diluted
91,469

 
91,884

 
91,687

 
90,175

Earnings (loss) per share
 
 
 
 
 
 
 
Basic
$
0.32

 
$
0.10

 
$
0.07

 
$
(1.81
)
Diluted
$
0.31

 
$
0.10

 
$
0.07

 
$
(1.81
)
(1) Total Operating expenses in Q4 included $125,092 goodwill and intangible assets impairment.