Current report filing

Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details)

v2.4.0.8
Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
General Discussion of Derivative Instruments and Hedging Activities [Abstract]      
Short-term derivative instruments $ 343 $ 664 $ 1,601
Short-term derivative instruments - liabilities $ 9,689 $ 10,442