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Earnings (Loss) Per Share
 12 Months Ended
Dec. 31, 2011
Earnings (Loss) Per Share [Abstract]  
Earnings (loss) per share [Text Block]
Earnings (Loss) Per Share:
Basic earnings (loss) per share is calculated using the weighted average number of shares of common stock outstanding during the period. Diluted earnings (loss) per share is computed in the same manner and also gives effect to all dilutive common equivalent shares outstanding during the period. Potential common shares that would have the effect of increasing diluted earnings per share are considered to be antidilutive. In accordance with U.S. GAAP, these shares were not included in calculating diluted earnings per share. For the year ended December 31, 2009, all outstanding stock options and restricted stock units were excluded from the computation of diluted loss per share totaling 2,188 and 1,372, respectively, because the effect in the period would be anti-dilutive. For the year ended December 31, 2010, the weighted average number of stock options and restricted stock units excluded from the computation of diluted earnings per share were 2,059 and 446, respectively. For the year ended December 31, 2011, the weighted average number of stock options and restricted stock units excluded from the computation of diluted earnings per share were 1,257 and 291, respectively. Diluted earnings per share-weighted average shares outstanding do not include any effect resulting from assumed conversion of the Notes and warrants (as described in Note 8) as their impact would be anti-dilutive.
The computations of basic and diluted income (loss) per share for the years ended December 31, 2009, 2010, and 2011 are as follows:

December 31,

2009

2010

2011
Numerator:








Net income (loss)
$
(29,628
)

$
27,015


$
25,226

Denominator:








Basic earnings (loss) per share - weighted average shares outstanding
30,888


31,286


31,744

Effect of potential diluted securities:








Employee stock options and restricted stock units - dilutive shares
—


206


512

Diluted earnings (loss) per share - weighted average shares outstanding
30,888


31,492


32,256

Earnings (loss) per share:








Basic
$
(0.96
)

$
0.86


$
0.79

Diluted
$
(0.96
)

$
0.86


$
0.78