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Note 7 - Earnings Per Common Share (Tables)
 9 Months Ended
Sep. 30, 2013
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
 
Quarters Ended
September 30,
 
Nine Months Ended
September 30,
 
2013
 
2012
 
2013
 
2012
Net income (loss)
$
29,323

 
$
(48,527
)
 
$
60,141

 
$
(34,270
)
Net (income) loss applicable to non-vested restricted shares
(416
)
 
715

 
(847
)
 
500

Net income (loss) applicable to common shares
$
28,907

 
$
(47,812
)
 
$
59,294

 
$
(33,770
)
Weighted-average common shares outstanding:
 
 
 
 
 
 
 
Weighted-average common shares outstanding
74,023

 
73,742

 
73,969

 
73,636

Dilutive effect of common stock equivalents
11

 
—

 
9

 
—

Weighted-average diluted common shares
  outstanding
74,034

 
73,742

 
73,978

 
73,636

Basic earnings (loss) per common share
$
0.39

 
$
(0.65
)
 
$
0.80

 
$
(0.46
)
Diluted earnings (loss) per common share
$
0.39

 
$
(0.65
)
 
$
0.80

 
$
(0.46
)
Anti-dilutive shares not included in the computation of
  diluted earnings per common share (1)
1,411,643

 
1,739,697

 
1,483,394

 
1,785,959


(1) 
This amount represents outstanding stock options for which the exercise price is greater than the average market price of the Company’s common stock.