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Energy Purchase Contracts (Tables)
 12 Months Ended
Dec. 31, 2013
Energy Purchase Contracts [Line Items]  
Schedule of Utility Total Expenses
 
2013
 
2012
 
2011
Utility power resources
$
524,810

 
$
523,416

 
$
557,619
Future Contractual Commitments for Power Resources and Natural Gas Resources
 
2014
 
2015
 
2016
 
2017
 
2018
 
Thereafter
 
Total
Power resources
$
201,693

 
$
125,072

 
$
112,570

 
$
110,405

 
$
106,200

 
$
874,990

 
$
1,530,930

Natural gas resources
102,651

 
64,860

 
46,665

 
43,011

 
37,570

 
482,986

 
777,743

Total
$
304,344

 
$
189,932

 
$
159,235

 
$
153,416

 
$
143,770

 
$
1,357,976

 
$
2,308,673
Contractual Obligations [Member]
  
Energy Purchase Contracts [Line Items]  
Future Contractual Commitments for Power Resources and Natural Gas Resources
 
2014
 
2015
 
2016
 
2017
 
2018
 
Thereafter
 
Total
Contractual obligations
$
30,197

 
$
27,236

 
$
30,543

 
$
29,199

 
$
23,534

 
$
211,392

 
$
352,101