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Equity Method Investments and Membership Interests in Joint Ventures (Tables)
 12 Months Ended
Dec. 31, 2015
Equity Method Investments and Joint Ventures [Abstract]  
Schedule Of Equity Method Investments
Below are the equity method investments reflected in the consolidated balance sheets: 
 
Investee
 
Knight Hawk
 
DTA
 
Millennium
 
Tongue River
 
DKRW
 
Tenaska
 
Other
 
Total
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balance at
January 1, 2013
 
$
149,063

 
$
15,462

 
$
32,214

 
$
14,697

 
$
15,515

 
$
15,264

 
$
—

 
$
242,215

Advances to (distributions from) affiliates, net
 
(13,536
)
 
3,644

 
6,476

 
4,004

 
—

 
—

 
200

 
788

Equity in comprehensive income (loss)
 
17,279

 
(4,969
)
 
(2,796
)
 
(282
)
 
(1,832
)
 
—

 
—

 
7,400

Impairment of equity investment
 
—

 
—

 
—

 
—

 
(13,683
)
 
(15,264
)
 
—

 
(28,947
)
Balance at
December 31, 2013
 
152,806

 
14,137

 
35,894

 
18,419

 
—

 
—

 
200

 
221,456

Advances to (distributions from) affiliates, net
 
(12,603
)
 
3,774

 
6,742

 
2,541

 
—

 
—

 
3,600

 
4,054

Equity in comprehensive income (loss)
 
18,274

 
(4,173
)
 
(2,413
)
 
(220
)
 
—

 
—

 
(1,136
)
 
10,332

Balance at
December 31, 2014
 
158,477

 
13,738

 
40,223

 
20,740

 
—

 
—

 
2,664

 
235,842

Advances to (distributions from) affiliates, net
 
(29,862
)
 
3,207

 
7,052

 
913

 
—

 
—

 
330

 
(18,360
)
Equity in comprehensive income (loss)
 
22,977

 
(3,706
)
 
(9,686
)
 
(328
)
 
—

 
—

 
(1,278
)
 
7,979

Impairment of equity investment
 
—

 
—

 
—

 
(21,325
)
 
—

 
—

 
—

 
(21,325
)
Sale of equity investment
 
—

 
—

 
—

 
—

 
—

 
—

 
(2,259
)
 
$
(2,259
)
Balance at
December 31, 2015
 
$
151,592

 
$
13,239

 
$
37,589

 
$
—

 
$
—

 
$
—

 
$
(543
)
 
$
201,877