Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Class A Common Stock [Member]	Dec. 31, 2011 Class A Common Stock [Member]	Jun. 30, 2012 Class B Common Stock [Member]	Dec. 31, 2011 Class B Common Stock [Member]
Allowance for Doubtful Accounts Receivable	$ 2,492	$ 3,794
Common Stock, Par Value (Shares)			$ 0.01	$ 0.01	$ 0.01	$ 0.01
Common Stock, Shares Authorized (Shares)			2,500,000	2,500,000	1,000,000	1,000,000
Common Stock, Shares Issued (Shares)			127,264	123,610	300,000	300,000
Common Stock, Shares Outstanding (Shares)			127,264	123,610	300,000	300,000