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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Allowance for doubtful accounts (in Dollars) | $ 637 | $ 2,064
Common Class B [Member] |  |
Common stock, shares authorized | 100,000,000 | 100,000,000
Common stock, shares issued | 57,010,132 | 56,503,759
Common stock, no 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, no par value (in Dollars per share) | $ 0 | $ 0
Class B Treasury Stock [Member] |  |
Treasury stock, shares | 4,768,925 | 4,739,462
Class A Treasury Stock [Member] |  |
Treasury stock, shares | 1,578,554 | 1,578,554

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