Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Allowance for doubtful accounts receivable	$ 2,265	$ 1,051
Liabilities and stockholders' equity:
Preferred stock, no par value
Preferred stock, cumulative redeemable designated	1,000	1,000
Preferred stock, shares issued	330	390
Preferred stock, shares outstanding	330	390
Preferred stock, aggregate liquidation value	$ 32,795	$ 39,307
Common Class A
Stockholders' equity:
Common stock, no par value
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, no par value
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	56,054,000	56,043,000
Class A Treasury Stock
Stockholders' equity:
Treasury stock, shares	1,579,000	1,579,000
Class B Treasury Stock
Stockholders' equity:
Treasury stock, shares	4,655,000	4,655,000