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Quarterly financial data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2015
Quarterly financial data (unaudited) [Abstract]  
Quarterly financial information
Quarterly financial information for the years ended December 31, 2015 and 2014 is presented in the following tables:

  
Quarter Ended
 
(in thousands, except per share data)
 
March 31,
  
June 30,
  
September 30,
  
December 31,
 
2015:
        
Revenue
 
$
63,633
  
$
126,112
  
$
164,940
  
$
168,104
 
Income (loss) from operations
  
(28,310
)
  
21,452
   
53,005
   
49,892
 
Net income (loss)
  
(21,519
)
  
14,100
   
36,942
   
33,347
 
Net income (loss) per share, basic
  
(0.57
)
  
0.37
   
0.95
   
0.85
 
Net income (loss) per share, diluted
  
(0.57
)
  
0.32
   
0.79
   
0.71
 
2014:
                
Revenue
 
$
53,884
  
$
110,325
  
$
137,954
  
$
147,975
 
Income (loss) from operations
  
(25,458
)
  
7,862
   
31,032
   
44,620
 
Net income (loss)
  
(20,236
)
  
5,029
   
21,832
   
30,116
 
Net income (loss) per share, basic
  
(0.55
)
  
0.13
   
0.58
   
0.80
 
Net income (loss) per share, diluted
  
(0.55
)
  
0.13
   
0.49
   
0.66