Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Comprehensive Income (Parenthetical)

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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements of Comprehensive Income [Abstract]      
Unrealized gain (loss) due to fair value adjustments on interest rate swap agreements, tax $ 3,786 $ 4,339 $ 2,359
Unrealized gain (loss) due to fair value adjustments on available-for-sale securities, tax $ 8,128 $ 3,425 $ 0