Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Equity and Comprehensive Income (Parenthetical)

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Consolidated Statements of Equity and Comprehensive Income (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2011
Consolidated Statements of Equity and Comprehensive Income [Abstract]  
Amount of taxes Fair value adjustments on interest rate swap agreements $ 3,786
Amount of taxes Fair value adjustments on available-for-sale securities 8,128
Write-off of accumulated other comprehensive loss related to cash flow hedges, net of taxes $ 723,000