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Consolidated Statements of Shareholders' Equity and Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Consolidated Statements of Shareholders' Equity and Comprehensive Income    
Unrealized gain (loss) from derivative instruments, tax (benefit) expense $ 644 $ (73)
Reclassification adjustment for losses included in net income, tax expense $ 3,733