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Consolidated Statements of Changes in Shareholders' Equity and Comprehensive Income (Loss) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements of Changes in Shareholders' Equity and Comprehensive Income (Loss)      
Unrealized loss on derivative instrument, taxes $ 256 $ 36 $ 1,050