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Consolidated Balance Sheets (Unaudited) (Parentheticals) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Accumulated depreciation (in Dollars) | $ 113,594 | $ 106,871
Preferred stock, par value (in Dollars per share) |  |
Preferred stock, shares authorized | 15,000 | 15,000
Preferred stock, shares outstanding | 0 | 0
Common Class A [Member] |  |
Common stock, par value (in Dollars per share) |  |
Common stock, shares authorized | 100,000 | 100,000
Common stock, shares issued | 23,544 | 23,329
Common stock, shares outstanding | 23,544 | 23,329
Common Class B [Member] |  |
Common stock, par value (in Dollars per share) |  |
Common stock, shares authorized | 25,000 | 25,000
Common stock, shares issued | 2,562 | 2,562
Common stock, shares outstanding | 2,562 | 2,562

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