Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Stockholders' equity    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized (in shares) 47,500 47,500
Common stock, shares issued (in shares) 28,374 27,472
Common stock, shares outstanding (in shares) 16,043 15,319
Treasury stock shares (in shares) 12,331 12,153