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REPURCHASES OF COMMON STOCK
 9 Months Ended
Sep. 30, 2013
REPURCHASES OF COMMON STOCK [Abstract]  
REPURCHASES OF COMMON STOCK
5.REPURCHASES OF COMMON STOCK

During the three- and nine-month periods ended September 30, 2013, the Company repurchased approximately 0.9 and 1.3 million shares of its Class A common stock under its open market repurchase plan for approximately $76.3 million and $90.9 million, respectively. During the three- and nine-month periods ended September 30, 2012, the Company repurchased approximately 1.5 million and 4.1 million shares of its Class A common stock under its open market repurchase plan for approximately $66.3 million and $179.6 million, respectively.   In July 2013, the Company's board of directors authorized a $400.0 million extension of the Company's ongoing share repurchase authorization. At September 30, 2013, $444.5 million was available for repurchases under the stock repurchase program.