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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (Unaudited) (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 [Abstract] |  |  |  |
Unrealized loss due to fair value adjustments on interest rate swap agreements, net of taxes | $ 48 | $ 3,888 | $ 72 | $ 4,180
Unrealized (loss) gain due to fair value adjustments on available-for-sale securities, net of taxes | $ 2,760 | $ 6,403 | $ 459 | $ 7,485

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