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Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Data (unaudited) [Abstract]  
Quarterly Financial Data (unaudited)
13.  Quarterly Financial Data (unaudited)

The following is a summary of the quarterly results of operations for 2011 and 2010:

   
(in thousands except per-share amounts)
 
2011
 
Year
   
First
Quarter
   
Second
Quarter
   
Third
Quarter
   
Fourth
Quarter
 
Total operating revenue
 
$
388,461
   
$
92,107
   
$
101,329
   
$
102,834
   
$
92,191
 
Loss from operations
   
(38,237
)
   
(8,782
)
   
(3,767
)
   
(13,477
)
   
(12,211
)
Net loss
   
(36,670
)
   
(7,937
)
   
(3,305
)
   
(13,668
)
   
(11,760
)
Net loss per share of common stock
                                       
Basic
 
$
(2.08
)
 
$
(0.45
)
 
$
(0.19
)
 
$
(0.77
)
 
$
(0.67
)
Diluted
 
$
(2.08
)
 
$
(0.45
)
 
$
(0.19
)
 
$
(0.77
)
 
$
(0.67
)
                          
2010
 
Year
   
First
Quarter
   
Second
Quarter
   
Third
Quarter
   
Fourth
Quarter
 
Total operating revenue
 
$
368,822
   
$
85,842
   
$
94,957
   
$
93,870
   
$
94,153
 
Loss from operations
   
(17,670
)
   
(5,562
)
   
(3,328
)
   
(6,863
)
   
(1,917
)
Net loss
   
(11,930
)
   
(3,723
)
   
(4,427
)
   
(2,281
)
   
(1,499
)
Net loss per share of common stock
                                       
Basic
 
$
(0.69
)
 
$
(0.22
)
 
$
(0.26
)
 
$
(0.13
)
 
$
(0.09
)
Diluted
 
$
(0.69
)
 
$
(0.22
)
 
$
(0.26
)
 
$
(0.13
)
 
$
(0.09
)

Net loss per share of common stock is computed independently for each quarter presented and is based on the average number of common and equivalent shares for the quarter. The sum of the quarterly net loss per share of common stock for a year may not equal the total for the year due to rounding differences.