Basic and Diluted Earnings Per Common Share (Details Textual) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Class A Common Stock [Member]	Dec. 31, 2011 Class A Common Stock [Member]	Jun. 30, 2011 Class A Common Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common Stock, par value					$ 0.01	$ 0.01	$ 0.01
Anti-dilutive unvested restricted stock, shares	3,588	123,605	6,740	152,902