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Consolidated Statement of Changes in Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statement of Changes in Equity |  |  |
Other comprehensive income, income tax benefit | $ 12,604 | $ 5,443 | $ 3,206

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