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Quarterly financial data (unaudited)
 12 Months Ended
Dec. 31, 2017
Quarterly financial data (unaudited) [Abstract]  
Quarterly financial data (unaudited)
19. Quarterly financial data (unaudited)

Quarterly financial information for the years ended December 31, 2017 and 2016 is presented in the following tables:

  
Quarter Ended
 
(in thousands, except per share data)
 
March 31,
  
June 30,
  
September 30,
  
December 31,
 
2017:
            
Revenue
 
$
116,858
  
$
100,772
  
$
149,434
  
$
193,809
 
Income from operations
  
14,910
   
8,529
   
47,769
   
53,077
 
Net income
  
10,485
   
4,616
   
33,551
   
33,942
 
                 
Net income per share-basic
 
$
0.26
  
$
0.11
  
$
0.81
  
$
0.77
 
Net income per share-diluted
 
$
0.23
  
$
0.11
  
$
0.68
  
$
0.67
 
                 
2016:
                
Revenue
 
$
102,964
  
$
91,241
  
$
142,914
  
$
151,663
 
Income (loss) from operations
  
21,157
   
(2,042
)
  
35,478
   
50,929
 
Net income (loss) from continuing operations
  
11,889
   
(2,042
)
  
20,388
   
32,289
 
Net income (loss) from discontinued operations (1)
  
(7,898
)
  
(8,905
)
  
952
   
5,103
 
Net income (loss)
  
3,991
   
(10,947
)
  
21,340
   
37,392
 
                 
Net income (loss) per share from continuing operations-basic
 
$
0.30
  
$
(0.05
)
 
$
0.50
  
$
0.80
 
Net income (loss) per share from discontinued operations-basic
  
(0.20
)
  
(0.22
)
  
0.02
   
0.13
 
Net income (loss) per share-basic
 
$
0.10
  
$
(0.27
)
 
$
0.52
  
$
0.93
 
                 
Net income (loss) per share from continuing operations-diluted
 
$
0.26
  
$
(0.05
)
 
$
0.43
  
$
0.67
 
Net income (loss) per share from discontinued operations-diluted
  
(0.16
)
  
(0.22
)
  
0.02
   
0.10
 
Net income (loss) per share-diluted
 
$
0.10
  
$
(0.27
)
 
$
0.45
  
$
0.77
 
                 

(1) Reflects a change in estimate attributed to higher pretax income within continuing operations. According to the ordering rules of intraperiod tax allocation, the residual amount of change after determining the effective rate for continuing operations is allocated to discontinued operations.