Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Statements of Cash Flows (Parenthetical)

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Condensed Consolidated Statements of Cash Flows (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Statement Of Cash Flows [Abstract]        
Tax effect of change in fair value of interest rate swap agreements $ 133 $ (72) $ 5,083 $ (50)