STOCKHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2012

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY

Common Stock

On December 3, 2012, the Company issued 6.9 million shares of common stock, including 900,000 shares of common stock issued upon exercise of the underwriters' option, at a public offering price of $56.00 per share. After deducting the underwriters' discount and offering expenses, the Company received net proceeds of $369.5 million from the issuance. The net proceeds from this offering were used to pay a portion of the purchase price to acquire Safety-Kleen on December 28, 2012.

Stock Split

On June 8, 2011, the Company's Board of Directors authorized a two-for-one stock split of the Company's common stock in the form of a stock dividend of one share for each outstanding share. The stock dividend was paid on July 26, 2011 to holders of record at the close of business on July 6, 2011. The stock split followed the approval, at the Company's 2011 annual meeting of stockholders, of a proposal to increase the Company's authorized shares of common stock from 40 million to 80 million. The stock split did not change the proportionate interest that a stockholder maintained in the Company. All share and per share information, including options, restricted and performance stock awards, stock option exercises, employee stock purchase plan purchases, common stock and additional paid-in capital accounts on the consolidated balance sheets and consolidated statements of income and stockholders' equity, have been retroactively adjusted to reflect the two-for-one stock split. In addition, awards granted and weighted average fair value of awards granted have also been retroactively adjusted.