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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

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