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Selected Quarterly Financial Data (Unaudited)
 12 Months Ended
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]  
Selected Quarterly Financial Data (Unaudited)
Selected Quarterly Financial Data (Unaudited)
 
Operating
Revenues
 
Net (Loss) Earnings
 
Basic Net
(Loss) Earnings
Per Share(1)
 
Diluted Net (Loss) Earnings Per
 Share(1)
2011
 
 
 
 
 
 
 
First Quarter
$
197,486

 
$
(52,497
)
 
$
(0.98
)
 
$
(0.98
)
Second Quarter
242,709

 
105,166

 
1.93

 
1.90

Third Quarter
238,763

 
134,001

 
2.45

 
2.42

Fourth Quarter
240,600

 
(414,733
)
 
(7.62
)
 
(7.62
)
 
$
919,558

 
$
(228,063
)
 
$
(4.21
)
 
$
(4.21
)
2010
 
 
 
 
 
 
 
First Quarter
$
166,012

 
$
17,669

 
$
0.34

 
$
0.34

Second Quarter
164,457

 
89,023

 
1.65

 
1.64

Third Quarter
166,040

 
(3,023
)
 
(0.06
)
 
(0.06
)
Fourth Quarter
180,001

 
(21,145
)
 
(0.40
)
 
(0.40
)
 
$
676,510

 
$
82,524

 
$
1.54

 
$
1.52

_______________________________________________________________________________
(1)
The sum of the individual quarterly net (loss) earnings per common share amounts may not agree with year-to-date net (loss) earnings per common share as each quarterly computation is based on the weighted-average number of common shares outstanding during that period. Potentially dilutive securities were included in the computation of diluted net (loss) earnings per common share for each quarter in which the Company reported net