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Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
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