Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Allowance for doubtful accounts (in Dollars)	$ 2,064	$ 2,314
Series D perpetual preferred stock, par value (in Dollars per share)	$ 0	$ 0
Series D perpetual preferred stock, designated shares	1,000	1,000
Series D perpetual preferred stock, shares issued	0.00	259
Series D perpetual preferred stock, shares outstanding	0.00	259
Series D perpetual preferred stock, aggregate liquidation value (in Dollars)	$ 0	$ 25,921
Common Class B [Member]
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	56,503,759	56,057,070
Common stock, par value (in Dollars per share)	$ 0	$ 0
Common Class A [Member]
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	7,331,574	7,331,574
Common stock, par value (in Dollars per share)	$ 0	$ 0
Class B Treasury Stock [Member]
Treasury stock, shares	4,739,462	4,654,750
Class A Treasury Stock [Member]
Treasury stock, shares	1,578,554	1,578,554