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Equity Investments And Membership Interests In Joint Ventures (Schedule Of Equity Method Investments) (Details) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]        
Revenues   $ 190,661 $ 184,358 $ 172,933
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning Balance   225,605 177,451 87,268
Investments in affiliates      43,489 87,405
Advances to (distributions from) affiliates, net   7,690 (6,646) (8,375)
Equity in comprehensive income (loss)   8,920 11,311 11,153
Ending Balance 177,451 242,215 225,605 177,451
Notes receivable from investees   43,828 35,810  
Knight Hawk [Member]
       
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning Balance   135,225 131,250 49,603
Investments in affiliates 26,600       77,637
Advances to (distributions from) affiliates, net   (7,151) (16,621) (12,639)
Equity in comprehensive income (loss)   20,989 20,596 16,649
Ending Balance 131,250 149,063 135,225 131,250
Notes receivable from investees          
DKRW [Member]
       
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning Balance   19,715 21,961 23,589
Investments in affiliates           
Advances to (distributions from) affiliates, net           
Equity in comprehensive income (loss)   (4,200) (2,246) (1,628)
Ending Balance 21,961 15,515 19,715 21,961
Notes receivable from investees   38,680 30,751  
DTA [Member]
       
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning Balance   16,086 14,472 14,076
Investments in affiliates           
Advances to (distributions from) affiliates, net   4,335 6,498 4,264
Equity in comprehensive income (loss)   (4,959) (4,884) (3,868)
Ending Balance 14,472 15,462 16,086 14,472
Notes receivable from investees          
Tenaska [Member]
       
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning Balance   15,266 9,768   
Investments in affiliates      5,500 9,768
Advances to (distributions from) affiliates, net           
Equity in comprehensive income (loss)   (2) (2)   
Ending Balance 9,768 15,264 15,266 9,768
Notes receivable from investees   5,148 5,059  
Millennium [Member]
       
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning Balance   26,324      
Investments in affiliates      25,000   
Advances to (distributions from) affiliates, net   8,798 3,477   
Equity in comprehensive income (loss)   (2,908) (2,153)   
Ending Balance    32,214 26,324   
Notes receivable from investees          
Tongue River [Member]
       
Investments in and Advances to Affiliates, at Fair Value [Roll Forward]        
Beginning Balance   12,989      
Investments in affiliates      12,989   
Advances to (distributions from) affiliates, net   1,708      
Equity in comprehensive income (loss)           
Ending Balance    14,697 12,989   
Notes receivable from investees