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Quarterly Financial Data (unaudited)
 12 Months Ended
Dec. 31, 2012
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 2012 and 2011:

 
 
(in thousands except per-share amounts)
 
2012
 
Year
 
 
First
Quarter
 
 
Second
Quarter
 
 
Third
Quarter
 
 
Fourth
Quarter
 
Total operating revenue
 
$
377,715
 
 
$
87,935
 
 
$
95,705
 
 
$
95,624
 
 
$
98,451
 
(Loss) income from operations
 
 
(13,355
)
 
 
(5,213
)
 
 
1,557
 
 
 
(5,296
)
 
 
(4,403
)
Net (loss) income
 
 
(15,056
)
 
 
(5,649
)
 
 
1,071
 
 
 
(5,663
)
 
 
(4,815
)
Net (loss) income per share of common stock
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic
 
$
(0.84
)
 
$
(0.32
)
 
$
0.06
 
 
$
(0.32
)
 
$
(0.27
)
Diluted
 
$
(0.84
)
 
$
(0.32
)
 
$
0.06
 
 
$
(0.32
)
 
$
(0.27
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
)

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.