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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY |  |  |
Proportionate share of other companies foreign currency translation adjustment, tax | $ 154 | $ 180 | $ 390
Net unrealized appreciation (depreciation) on marketable securities, tax | $ 194 | $ 327 | $ 457
Cash dividends declared (in dollars per share) | $ 0.16 | $ 0.16 | $ 0.16

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