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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Condensed Consolidated Statements Of Comprehensive Income [Abstract]  
Unrealized loss on change in fair value of interest rate swap contracts, tax $ 93
Reclassificaiton adjustment for losses currently in net income, tax $ (2)