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Income (loss) per common share (Tables)
 6 Months Ended
Jun. 30, 2012
Income (loss) per common share [Abstract]  
Basic and diluted loss per common share
Basic and diluted income (loss) per common share was computed as follows:

 
 
(in thousands, except per share amounts)
 
 
 
Three Months Ended
June 30,
 
 
Six Months Ended
June 30,
 
 
 
2012
 
 
2011
 
 
2012
 
 
2011
 
Numerator:
 
 
 
 
 
 
 
 
 
 
 
 
   Net income (loss)
 
$
1,071
 
 
$
(3,305
)
 
$
(4,578
)
 
$
(11,242
)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   Basic-weighted average shares
 
 
17,872
 
 
 
17,534
 
 
 
17,799
 
 
 
17,490
 
   Effect of dilutive stock options
 
 
-
 
 
 
-
 
 
 
-
 
 
 
-
 
   Diluted-weighted average shares
 
 
17,872
 
 
 
17,534
 
 
 
17,799
 
 
 
17,490
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Basic income (loss) per common share
 
$
0.06
 
 
$
(0.19
)
 
$
(0.26
)
 
$
(0.64
)
Diluted income (loss) per common share
 
$
0.06
 
 
$
(0.19
)
 
$
(0.26
)
 
$
(0.64
)