STOCKHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2013

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 $369.3 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.