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Quarterly financial data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly financial data (unaudited) [Abstract]  
Quarterly financial information
Quarterly financial information for the years ended December 31, 2012 and 2011 is presented in the following tables:

 
 
Three months ended
 
(in thousands)
 
March 31,
 
 
June 30,
 
 
September 30,
 
 
December 31,
 
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
 
Fiscal year 2011
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenue
 
$
18,533
 
 
$
88,141
 
 
$
58,762
 
 
$
107,948
 
Income (loss) from operations
 
 
(35,506
)
 
 
20,207
 
 
 
1,408
 
 
 
45,990
 
Net income (loss)
 
 
(21,397
)
 
 
14,210
 
 
 
1,549
 
 
 
28,657
 
Net income (loss) per share, basic
 
 
(0.61
)
 
 
0.40
 
 
 
0.04
 
 
 
0.80
 
Net income (loss) per share, diluted
 
 
(0.61
)
 
 
0.39
 
 
 
0.04
 
 
 
0.78