Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Deficit)

Shareholders' Equity (Deficit)
12 Months Ended
Dec. 31, 2017
Shareholders' Equity (Deficit) [Abstract]  
Shareholders' Equity (Deficit)


Preferred stockAuthorized preferred stock consists of 500,000 shares with a par value of $25 per share. No shares of preferred stock were issued and outstanding as of December 31, 2017 or 2016.  

Treasury stockIn the years ended December 31, 2017,  2016 and 2015, we withheld 26,000,  40,926 and 120,455 shares, respectively, in connection with cashless stock option exercises and restricted stock vestings to satisfy tax withholding obligations related to stock option exercises.