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SELECTED QUARTERLY INFORMATION (UNAUDITED)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
SELECTED QUARTERLY INFORMATION (UNAUDITED)
17. SELECTED QUARTERLY INFORMATION (UNAUDITED)
(in thousands, except per share amounts)
2018
1st Quarter
 
2nd Quarter
 
3rd Quarter
 
4th Quarter
Revenue
$
235,182

 
$
196,779

 
$
203,263

 
$
256,357

Gross profit
$
159,568

 
$
122,962

 
$
128,840

 
$
178,446

Income (loss) from operations
$
7,936

 
$
(23,163
)
 
$
(17,258
)
 
$
15,453

Net income (loss)
$
12,200

 
$
(10,409
)
 
$
(7,587
)
 
$
16,413

Earnings (loss) per share:
 
 
 
 
 
 
 
Basic
$
0.16

 
$
(0.13
)
 
$
(0.10
)
 
$
0.21

Diluted
$
0.15

 
$
(0.13
)
 
$
(0.10
)
 
$
0.20

(in thousands, except per share amounts)
2017
1st Quarter
 
2nd Quarter
 
3rd Quarter
 
4th Quarter
Revenue
$
256,309

 
$
186,596

 
$
190,957

 
$
254,605

Gross profit
$
188,219

 
$
118,721

 
$
121,226

 
$
180,628

Income (loss) from operations
$
65,907

 
$
(8,947
)
 
$
(2,301
)
 
$
38,518

Net income
$
52,963

 
$
3,702

 
$
1,288

 
$
40,595

Earnings per share:
 
 
 
 
 
 
 
Basic
$
0.69

 
$
0.05

 
$
0.01

 
$
0.52

Diluted
$
0.65

 
$
0.04

 
$
0.01

 
$
0.49