Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts	$ 1,191	$ 1,115
Stockholders' Deficit:
Preferred stock, shares authorized	20,262,000	20,262,000
Preferred stock, par value	$ 0.01	$ 0.01
Treasury stock, shares	23,523,878	24,061,327
13 3/4% Series A Cumulative Exchangeable Redeemable Preferred Stock
Stockholders' Deficit:
Preferred stock, shares authorized	250,000	250,000
Preferred stock, par value	$ 1,000	$ 1,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
12% Series B Cumulative Preferred Stock
Stockholders' Deficit:
Preferred stock, shares authorized	12,000	12,000
Preferred stock, par value	$ 10,000	$ 10,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common Class A
Stockholders' Deficit:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	59,622,249	59,599,857
Common stock, shares outstanding	36,098,371	35,538,530
Common Class B
Stockholders' Deficit:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	5,809,191	5,809,191
Common stock, shares outstanding	5,809,191	5,809,191
Common Class C
Stockholders' Deficit:
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	644,871	644,871
Common stock, shares outstanding	644,871	644,871