Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Jun. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts receivable	$ 1,541	$ 1,051
Liabilities and stockholders' equity:
Preferred stock, par value	$ 0	$ 0
Preferred stock, cumulative redeemable designated	1,000	1,000
Preferred stock, shares issued	390	390
Preferred stock, shares outstanding	390	390
Preferred stock, aggregate liquidation value	$ 39,307	$ 39,307
Common Class A
Stockholders' equity:
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	7,332,000	7,332,000
Common Class B
Stockholders' equity:
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	56,051,000	56,043,000
Treasury Stock Class A Common Stock
Stockholders' equity:
Treasury stock, shares	1,579,000	1,579,000
Treasury Stock Class B Common Stock
Stockholders' equity:
Treasury stock, shares	4,655,000	4,655,000