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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Consolidated Statements of Comprehensive Income    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax   $ 5
Reclassification of unrealized derivative gain on cash flow hedges to earnings, tax $ 5