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SHAREHOLDERS' EQUITY	9 Months Ended
SHAREHOLDERS' EQUITY	Sep. 30, 2017
Stockholders' Equity Note [Abstract]
SHAREHOLDERS’ EQUITY	SHAREHOLDERS’ EQUITY We make repurchases of our common stock mainly through the use of open market purchases and, at times, through accelerated share repurchase programs. As of September 30, 2017, we were authorized to repurchase up to $264.9 million of our common stock. During the three and nine months ended September 30, 2017, respectively, through open market repurchase plans, we repurchased and retired 311,593 and 376,309 shares of our common stock, at a cost of $29.0 million and $34.8 million, or an average cost of $93.09 and $92.51 per share, including commissions. During the three and nine months ended September 30, 2016, respectively, through open market repurchase plans, we repurchased and retired 484,256 and 1,142,415 shares of our common stock at a cost of $35.5 million and $80.3 million, or an average cost of $73.25 and $70.29 per share, including commissions. In addition to shares repurchased through open market repurchase plans, we repurchased 673,212 shares of our common stock at a cost of $50.0 million, or an average cost of $74.27 per share, including commissions, through an accelerated share repurchase program during the nine months ended September 30, 2016.