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Weighted Average Shares Outstanding (Tables)
12 Months Ended
Dec. 31, 2012
Weighted Average Number of Shares Outstanding Reconciliation [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block]
A reconciliation of the weighted average shares outstanding used in calculating basic and diluted net income (loss) per share in the accompanying consolidated statements of operations is as follows (in thousands):
Years Ended December 31,
 
2012
 
2011
 
2010
Weighted average shares outstanding:
 
 
 
 
 
 
Weighted average common stock outstanding
 
38,689

 
38,677

 
38,750

Less: weighted average unvested restricted stock outstanding
 
242

 
560

 
930

Total basic weighted average shares outstanding
 
38,447

 
38,117

 
37,820

Diluted weighted average shares outstanding:
 
 
 
 
 
 
Weighted average common stock outstanding, basic
 
38,447

 
38,117

 
37,820

Effect of dilutive securities:
 

 

 

Common stock options and restricted stock units1
 
629

 
356

 

Total weighted average shares outstanding assuming dilution
 
39,076

 
38,473

 
37,820

1Due to the net loss for the year ended December 31, 2010, common stock options and restricted stock units representing 161,000 shares were excluded from the number of shares used in calculating diluted loss per share for that period, as their inclusion would be antidilutive.