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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2017
Selected Quarterly Financial Information [Abstract]  
Selected Quarterly Financial Data (Unaudited)
Selected Quarterly Financial Data (Unaudited)

Selected summarized quarterly financial information for 2016 and 2017 is as follows (in thousands, except per share amounts):
 
For the Year Ended December 31, 2017
First 
Quarter
 
Second 
Quarter
 
Third 
Quarter
 
Fourth
 Quarter
 
Year
Revenue
$
41,556

 
$
34,566

 
$
31,466

 
$
83,118

 
$
190,706

Income (loss) from operations
(4,113
)
 
(10,468
)
 
(15,673
)
 
20,802

 
(9,452
)
Net income (loss)
1,080

 
(1,506
)
 
(2,176
)
 
28,028

 
25,426

Net income (loss) per share:
 

 
 

 
 

 
 

 
 

Basic
$
0.06

 
$
(0.08
)
 
$
(0.12
)
 
$
1.50

 
$
1.37

Diluted
$
0.06

 
$
(0.08
)
 
$
(0.12
)
 
$
1.47

 
$
1.33

 
 
 
 
 
 
 
 
 
 
For the Year Ended December 31, 2016
First 
Quarter
 
Second 
Quarter
 
Third 
Quarter
 
Fourth
 Quarter
 
Year
Revenue
$
51,411

 
$
35,856

 
$
28,642

 
$
77,415

 
$
193,324

Income (loss) from operations
3,149

 
(6,989
)
 
(10,078
)
 
16,741

 
2,823

Net income (loss)
(795
)
 
1,495

 
3,448

 
(3,844
)
 
304

Net income (loss) per share:
 

 
 

 
 

 
 

 
 

Basic
$
(0.04
)
 
$
0.08

 
$
0.19

 
$
(0.21
)
 
$
0.02

Diluted
$
(0.04
)
 
$
0.08

 
$
0.19

 
$
(0.21
)
 
$
0.02