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Equity Investments And Membership Interests In Joint Ventures (Tables)
 9 Months Ended
Sep. 30, 2013
Equity Method Investments and Joint Ventures [Abstract]  
Schedule Of Equity Method Investments
 
In thousands
 
Knight Hawk
 
DKRW
 
DTA
 
Tenaska
 
Millennium
 
Tongue River
 
Total
Balance at December 31, 2012
 
$
149,063

 
$
15,515

 
$
15,462

 
$
15,264

 
$
32,214

 
$
14,697

 
$
242,215

Advances to (distributions from) affiliates, net
 
(5,342
)
 
—

 
2,537

 
—

 
4,954

 
2,696

 
4,845

Equity in comprehensive income (loss)
 
13,362

 
(1,832
)
 
(3,855
)
 
—

 
(1,953
)
 
(281
)
 
5,441

Impairment of equity investment
 
—

 
(13,683
)
 
—

 
(15,264
)
 
—

 
—

 
(28,947
)
Balance at September 30, 2013
 
$
157,083

 
$
—

 
$
14,144

 
$
—

 
$
35,215

 
$
17,112

 
$
223,554