Annual report pursuant to Section 13 and 15(d)

Hedging Activities (Schedule Of Derivative Instrument Hedging Activities Cumulative Other Comprehensive Income) (Details)

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Hedging Activities (Schedule Of Derivative Instrument Hedging Activities Cumulative Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
General Discussion of Derivative Instruments and Hedging Activities [Abstract]        
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax $ (9,660) $ 1,576 $ (4,720) $ (18,736)