Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Class A Common Stock
Par value	$ 0.01	$ 0.01
Shares authorized	100,000	100,000
Shares issued	21,967	21,917
Shares outstanding	21,967	21,917
Restricted Class A Common Stock
Par value	$ 0.01	$ 0.01
Shares issued	244	33
Shares outstanding	244	33