Year Ended December 31,

2012

2011

2010

(in thousands, except per share amounts)

Numerator:

Net income (loss) available to common stockholders

($25,463

)

($159,606

)

$12,346

Denominator:

Weighted average shares outstanding—basic

35,849

35,617

34,204

Potential common shares—options (treasury stock method)

-

411

Weighted average shares outstanding—diluted

35,849

35,617

34,615

Shares excluded (anti-dilutive)

174

126

-

Shares excluded due to an exercise price greater than weighted average stock price for the period

1,453

1,561

1,950

Net income (loss) per common share:

Basic

($0.71

)

($4.48

)

$0.36

Diluted

($0.71

)

($4.48

)

$0.36