Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts	$ 1,502	$ 1,115
Stockholders' equity (deficit):
Preferred stock, par value	$ 0.01	$ 0.01
Treasury stock, shares	23,523,878	24,061,327
Series A Cumulative Redeemable Preferred Stock
Stockholders' equity (deficit):
Preferred stock, par value	$ 1,000	$ 1,000
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares issued	125,000	0
Preferred stock, shares outstanding	125,000	0
Class A Common Stock
Stockholders' equity (deficit):
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	142,984,733	59,599,857
Common stock, shares outstanding	119,460,855	35,538,530
Class B Common Stock
Stockholders' equity (deficit):
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	600,000,000	600,000,000
Common stock, shares issued	12,439,667	12,439,667
Common stock, shares outstanding	5,809,191	5,809,191
Class C Common Stock
Stockholders' equity (deficit):
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	644,871	644,871
Common stock, shares issued	644,871	644,871
Common stock, shares outstanding	644,871	644,871