Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
shares in Thousands
Jun. 30, 2017
Dec. 31, 2016
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) 31,278 30,507
Common stock, shares outstanding (in shares) 16,932 16,897
Treasury stock, shares (in shares) 14,346 13,610