For a discussion of risk factors, please read Item 1A, "Risk Factors" in the 2017 Form 10-K. There have been no material changes from those risk factors.
Unregistered Sales of Equity Securities and Use of Proceeds
The following table provides information on our purchase of equity securities during the quarter ended March 31, 2018.
Purchased as Part
or Programs (2)
Dollar Value) of
May Yet Be
Purchased Under the
Plans or Programs (2)
Represents shares withheld in satisfaction of withholding taxes due upon the vesting of restricted stock units granted to our employees under the 2013 Plan.
In November 2014, our Board of Directors authorized a $250 million share repurchase program (the "2014 Program"). In November 2015, our Board of Directors approved the expansion of the 2014 Program by an additional $150 million. As of March 31, 2018, 4,193,598 shares of common stock had been acquired at an aggregate purchase price of approximately $229 million under the 2014 Program. Transaction fees and commissions are not reported in the average price paid per share in the table above. Decisions regarding the amount and the timing of purchases under the 2014 Program will be influenced by our cash on hand, our cash flow from operations, general market conditions and other factors. The 2014 Program may be discontinued by our Board of Directors at any time.