Consolidated Balance Sheet (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Allowance for doubtful accounts receivable	$ 2,314	$ 1,051
Preferred stock, no par value
Preferred stock, cumulative redeemable designated	1,000	1,000
Preferred stock, shares issued	260	390
Temporary Equity, Shares Outstanding	260	390
Preferred stock, aggregate liquidation value	$ 25,921	$ 39,307
Common Class B
Common stock, par value	$ 0	$ 0
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	56,057,000	56,043,000
Common Class A
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
Class B Treasury Stock
Treasury stock, shares	4,655,000	4,655,000
Class A Treasury Stock
Treasury stock, shares	1,579,000	1,579,000