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 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Condensed Consolidated Statements of Cash Flows [Abstract]        
Tax effect of change in fair value of interest rate swap agreements $ 3,856 $ (1,044) $ 4,950 $ 22