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Related Party Transactions (Tables)
12 Months Ended
Dec. 31, 2014
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
The table below summarizes the nature and amount of related party transactions of PNMR, PNM and TNMP:    
 
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
 
 
(In thousands)
 
 
Services billings:
 
 
 
 
 
PNMR to PNM
$
86,871

 
$
92,597

 
$
99,986

PNMR to TNMP
28,349

 
28,937

 
29,110

PNM to TNMP
524

 
562

 
595

TNMP to PNMR
31

 
7

 
15

Income tax sharing payments:
 
 
 
 
 
PNMR to TNMP

 

 
1,951

PNMR to PNM

 
77,433

 
63,114

  TNMP to PNMR

 
3,643

 

Interest payments:
 
 
 
 
 
PNM to PNMR
65

 
4

 
1

TNMP to PNMR
309

 
481

 
137