Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Common stock, shares authorized	200,000,000
Common stock, shares issued	23,173,226
CommonClassARestrictedMember
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	537,000	244,000
Common stock, shares outstanding	537,000	244,000
Class A Common Stock
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	21,979,000	21,967,000
Common stock, shares outstanding	21,979,000	21,967,000