Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Class A Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	350,000,000	350,000,000
Common Stock, shares issued	32,335,687	32,260,936
Common Stock, shares outstanding	32,276,287	32,201,536
Treasury stock, shares	59,400	59,400
Class B Common Stock
Common Stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized	150,000,000	150,000,000
Common Stock, shares issued	24,984,625	24,984,625
Common Stock, shares outstanding	24,984,625	24,984,625