Quarterly financial data (unaudited)
 12 Months Ended
Dec. 31, 2013
Quarterly financial data (unaudited) [Abstract]  
Quarterly financial data (unaudited)

22. Quarterly financial data (unaudited)

Quarterly financial information for the years ended December 31, 2013 and 2012 is presented in the following tables:

 
 
Three months ended
 
(in thousands)
 
March 31,
  
June 30,
  
September 30,
  
December 31,
 
Fiscal year 2013
 
  
  
  
 
Revenue
 
$
43,100
  
$
82,436
  
$
89,102
  
$
98,107
 
Income (loss) from operations
  
(13,350
)
  
14,712
   
18,147
   
23,293
 
Net income (loss)
  
(8,062
)
  
10,484
   
13,491
   
15,222
 
Net income (loss) per share, basic
  
(0.22
)
  
0.29
   
0.37
   
0.42
 
Net income (loss) per share, diluted
  
(0.22
)
  
0.29
   
0.36
   
0.41
 
Fiscal year 2012
                
Revenue
 
$
50,311
  
$
70,379
  
$
66,592
  
$
94,606
 
Income (loss) from operations
  
(12,538
)
  
8,653
   
9,817
   
24,035
 
Net income (loss)
  
(6,829
)
  
7,632
   
6,617
   
16,104
 
Net income (loss) per share, basic
  
(0.19
)
  
0.21
   
0.18
   
0.45
 
Net income (loss) per share, diluted
  
(0.19
)
  
0.21
   
0.18
   
0.44