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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Exercise of options, income tax expense | $ 994 | $ 846 | $ 227
Restricted share grants, settled shares | 178 | 119 | 106

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