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Equity Investments And Membership Interests In Joint Ventures (Narrative) (Details) (USD $)
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Jun. 30, 2013
Tenaska [Member]
Sep. 30, 2013
DKRW [Member]
Sep. 30, 2013
Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]              
Equity method investment impairment $ 200,397,000 $ (2,144,000) $ 220,879,000 $ 523,439,000 $ 20,500,000 $ 57,700,000  
Impairment of equity investment     (28,947,000)   (15,264,000) (13,683,000)  
Note Receivable from Equity Method Investee, Write-downs         5,200,000 44,000,000  
Equity Method Investment, Ownership Percentage         35.00% 24.00%  
Future development costs, maximum limit             $ 58,500,000