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Earnings per share (Tables)
 6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Basic and diluted earnings (loss) per share
The following table shows the basic and diluted earnings per share for three and six months ended June 30, 2012 and 2011:
 
For the three months ended June 30,
 
2012
 
2011
 
Income
Shares (000)
Per-Share
 
Income
Shares (000)
Per-Share
Net income (loss)
$
(12,277
)
 
 
 
$
23,986

 
 
Amount allocated to common shareholders
100
%
 
 
 
91.97
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Income (loss) allocable to common shareholders
(12,277
)
88,452

$
(0.14
)
 
22,061

93,105

$
0.24

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Stock compensation plans
—

—

 
 
—

462

 
Diluted EPS:
 
 
 
 
 
 
 
Income (loss) applicable to common shareholders with assumed conversion
$
(12,277
)
88,452

$
(0.14
)
 
$
22,061

93,567

$
0.24

 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
2012
 
2011
 
Income
Shares (000)
Per-Share
 
Income
Shares (000)
Per-Share
Net income (loss)
$
(16,678
)
 
 
 
$
49,032

 
 
Amount allocated to common shareholders
100
%
 
 
 
91.91
%
 
 
Basic EPS:
 
 
 
 
 
 
 
Income (loss) allocable to common shareholders
(16,678
)
88,589

$
(0.19
)
 
45,066

93,036

$
0.48

Effect of Dilutive Securities:
 
 
 
 
 
 
 
Stock compensation plans
—

—

 
 
—

396

 
Diluted EPS:
 
 
 
 
 
 
 
Income (loss) applicable to common shareholders with assumed conversion
$
(16,678
)
88,589

$
(0.19
)
 
$
45,066

93,432

$
0.48

 
 
 
 
 
 
 
 
Schedule of Antidilutive Securities Excluded from Computation of Earnings per Share
Calculation of EPS:
 
Three months ended June 30,
Six months ended June 30,
 
2012
2011
2012
2011
Options to purchase common stock outstanding
626,334

641,187

626,334

641,187

Weighted average service-based stock awards outstanding
395,791

343,148

370,658

280,366

Excluded from the calculation of diluted EPS:
 
 
 
 
Stock options (1)
626,334

349,000

632,334

349,000

Service-based share award
395,791

—

370,658

—

(1)
These stock option awards were excluded from the calculation of diluted EPS because the exercise price of these options was greater than the average market price of the underlying common stock, except in periods when we had a net loss where all option were excluded because of their antidilutive effect on earnings per share.