Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical)

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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Cash Flows [Abstract]    
Tax effect of change in fair value of interest rate swap agreements $ 1,094 $ 1,066