STOCKHOLDERS' EQUITY

12 Months Ended

Dec. 31, 2017

Equity [Abstract]

STOCKHOLDERS' EQUITY

STOCKHOLDERS' EQUITY

On October 31, 2017, the Company's board of directors increased the size of the Company’s current share repurchase program from $300 million to $600 million. The Company has funded and intends to continue to fund the repurchases through available cash resources. The repurchase program authorizes the Company to purchase the Company's common stock on the open market or in privately negotiated transactions periodically in a manner that complies with applicable U.S. securities laws. The number of shares purchased and the timing of the purchases has depended and will depend on a number of factors including share price, cash required for future business plans, trading volume and other conditions.  The Company has no obligation to repurchase stock under this program and may suspend or terminate the repurchase program at any time. During the years ended December 31, 2017, 2016 and 2015, the Company repurchased and retired a total of approximately 0.9 million, 0.5 million and 1.4 million shares, respectively, of the Company's common stock for total costs of approximately $49.0 million, $22.2 million and $73.3 million, respectively. Through December 31, 2017, the Company has repurchased and retired a total of approximately 4.8 million shares of its common stock for approximately $248.8 million under this program. As of December 31, 2017, an additional $351.2 million remained available for repurchase of shares under this program.