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Quarterly Financial Information (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]  
Summary of consolidated quarterly financial information
The following is a summary of consolidated quarterly financial information (in thousands, except per share amounts): 
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
2018
 
 
 
 
 
 
 
Net revenues
$
164,262

 
$
204,625

 
$
212,575

 
$
158,356

Gross profit
12,983

 
42,897

 
51,993

 
13,811

Net income (loss)
(2,560
)
 
17,784

 
27,121

 
(13,747
)
Basic earnings (loss) per common share
$
(0.02
)
 
$
0.12

 
$
0.18

 
$
(0.09
)
Diluted earnings (loss) per common share
$
(0.02
)
 
$
0.12

 
$
0.18

 
$
(0.09
)
 
Quarter Ended
 
March 31,
 
June 30,
 
September 30,
 
December 31,
2017
 
 
 
 
 
 
 
Net revenues
$
104,528

 
$
150,329

 
$
163,260

 
$
163,266

Gross profit (loss)
(825
)
 
18,367

 
21,141

 
23,483

Net income (loss) (1)
(16,415
)
 
(6,403
)
 
2,290

 
50,580

Basic earnings (loss) per common share
$
(0.11
)
 
$
(0.04
)
 
$
0.02

 
$
0.34

Diluted earnings (loss) per common share
$
(0.11
)
 
$
(0.04
)
 
$
0.02

 
$
0.34


(1)
Amount in the fourth quarter of 2017 included a $51.6 million income tax benefit as a result of the U.S. tax law changes enacted in December 2017.