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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Statement of Cash Flows [Abstract] |  |  |
Adjustments to additional paid-in capital | $ 1,240 |  |
Adjustments to accumulated deficit | 992 |  |
Net of deferred taxes upon change in accounting principle | $ 543 |  |

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