XML 75 R6.htm IDEA: XBRL DOCUMENT

CONSOLIDATED STATEMENTS OF STOCKHOLDERS EQUITY (Parenthetical)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Repurchase of Class A Common Stock, shares	1,473,863	4,353,801	3,349,286
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards, shares	488,863	809,084	765,078
Additional Paid-in Capital [Member]
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards, shares	488,863	809,084	765,078
Treasury Stock [Member]
Repurchase of Class A Common Stock, shares	1,473,863	4,353,801	3,349,286
Issuance of treasury shares upon exercise of stock options, purchases under stock purchase plan and grants of restricted stock awards, shares	488,863	809,084	765,078

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References+ Details