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(Loss) Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2012
(Loss) Earnings Per Common Share [Abstract]  
Earnings per share

 
Three Months Ended
 
 
Nine Months Ended
 
 
September 30,
 
 
September 30,
 
 
2012
 
 
2011
 
 
2012
 
 
2011
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
Net (loss) income
 
$
(2,017
)
 
$
61,949
 
 
$
83,324
 
 
$
163,293
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Denominator for basic earnings per common share-weighted average shares
 
 
59,558
 
 
 
66,655
 
 
 
62,087
 
 
 
67,722
 
Effect of dilutive securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
     Employee stock-based compensation
 
 
—
 
 
 
1,916
 
 
 
1,537
 
 
 
2,125
 
Denominator for diluted earnings per common share-adjusted weighted average shares
 
 
59,558
 
 
 
68,571
 
 
 
63,624
 
 
 
69,847
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic (loss) earnings per common share
 
$
(0.03
)
 
$
0.93
 
 
$
1.34
 
 
$
2.41
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Diluted (loss) earnings per common share
 
$
(0.03
)
 
$
0.90
 
 
$
1.31
 
 
$
2.34