Annual report pursuant to Section 13 and 15(d)

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

v2.4.0.6
Hedging Activities (Schedule Of Derivative Instruments In Statement Of Financial Position) (Details) (USD $)
Dec. 31, 2011
Dec. 31, 2010
Hedging Activities [Abstract]    
Short-term derivative instruments - asset $ 1,601,000  
Short-term derivative instruments - liabilities   $ 4,720,000