Stockholders' Equity (Deficit) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended		1 Months Ended				12 Months Ended	1 Months Ended		12 Months Ended
	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2011 Class A and B Common Stock	Dec. 31, 2009 Class A and B Common Stock	Dec. 31, 2011 Class A common stock	Dec. 31, 2009 Class A common stock	Dec. 31, 2011 Class A common stock	Dec. 31, 2011 Class B common stock	Dec. 31, 2009 Class B common stock	Dec. 31, 2011 Class B common stock	Dec. 31, 2011 Class C common stock vote
Stockholders Equity (Deficit)
Votes per share							1 vote			10 votes	1 vote
Number of shares of Class A common stock into which each share of common stock is convertible										1	1
Votes per share in the event of change of control											10
Cash Dividend
Cash dividend paid per share					$ 2.00	$ 2.00		$ 2.00	$ 2.00
Cash dividend paid	$ 893,278	$ 894,150	$ 893,278	$ 894,150