Quarterly report pursuant to Section 13 or 15(d)

UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical)

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UNAUDITED CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Convertible preferred stock issued 0 0
Common Class A [Member]
   
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100,000,000 100,000,000
Common stock, shares issued 62,005,303 61,584,248
Common stock, shares outstanding 40,606,910 40,683,984
Treasury stock, shares 21,398,393 20,900,264
Common Class B [Member]
   
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 30,000,000 30,000,000
Common stock, shares issued 12,029,375 12,029,375
Common stock, shares outstanding 12,029,375 12,029,375