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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME        
Unrealized gain (loss) on available-for-sale securities, tax $ 1   $ 1 $ (2)
Change in fair value of interest rate swap, tax (103) (703) (367) (703)
Reclass of gain/loss to income on settlement of interest rate swap, tax $ 66 $ 39 $ 194 $ 39