Consolidated Balance Sheets Parentheticals - $ / shares	Jun. 30, 2015	Dec. 31, 2014
Class A Common Stock, $0.01 par value, one vote per share; 180,000,000 shares authorized at June 30, 2015 and December 31, 2014; 65,966,791 and 65,632,309 shares issued and 53,242,722 and 52,938,267 shares outstanding (net of 12,724,069 and 12,694,042 shares in treasury) on June 30, 2015 and December 31, 2014, respectively
Common Stock, par value per share	$ 0.01	$ 0.01
Common Stock, shares authorized	180,000,000	180,000,000
Common Stock, shares issued	65,966,791	65,632,309
Common Stock, shares outstanding	53,242,722	52,938,267
Treasury Stock, shares	12,724,069	12,694,042
Class B Common Stock, $0.01 par value, ten votes per share; 30,000,000 shares authorized at June 30, 2015 and December 31, 2014; 843,892 and 1,020,485 shares issued and outstanding on June 30, 2015 and December 31, 2014, respectively
Common Stock, par value per share	$ 0.01	$ 0.01
Common Stock, shares authorized	30,000,000	30,000,000
Common Stock, shares issued	843,892	1,020,485
Common Stock, shares outstanding	843,892	1,020,485