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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2017
Segment Reporting [Abstract]  
Summary of Segments
The following tables present summarized financial information for PNMR by segment. PNM and TNMP each operate in only one segment. Therefore, tabular segment information is not presented for PNM and TNMP.
 
2017
PNM
 
TNMP
 
Corporate
and Other
 
PNMR Consolidated
 
(In thousands)
Electric operating revenues
$
1,104,230

 
$
340,773

 
$
—

 
$
1,445,003

Cost of energy
321,677

 
85,802

 
—

 
407,479

Utility margin
782,553

 
254,971

 
—

 
1,037,524

Other operating expenses
423,011

 
98,221

 
(22,135
)
 
499,097

Depreciation and amortization
147,017

 
63,146

 
21,779

 
231,942

Operating income
212,525

 
93,604

 
356

 
306,485

Interest income
8,454

 
—

 
7,462

 
15,916

Other income (deductions)
30,686

 
3,551

 
(3,254
)
 
30,983

Interest charges
(82,697
)
 
(30,084
)
 
(14,844
)
 
(127,625
)
Segment earnings (loss) before income taxes
168,968

 
67,071

 
(10,280
)
 
225,759

Income taxes
81,555

 
31,512

 
17,273

 
130,340

Segment earnings (loss)
87,413

 
35,559

 
(27,553
)
 
95,419

Valencia non-controlling interest
(15,017
)
 
—

 
—

 
(15,017
)
Subsidiary preferred stock dividends
(528
)
 
—

 
—

 
(528
)
Segment earnings (loss) attributable to PNMR
$
71,868

 
$
35,559

 
$
(27,553
)
 
$
79,874

 
 
 
 
 
 
 
 
At December 31, 2017:
 
 
 
 
 
 
 
Total Assets
$
4,921,563

 
$
1,500,770

 
$
223,770

 
$
6,646,103

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

2016
PNM
 
TNMP
 
Corporate
and Other
 
PNMR Consolidated
 
 
 
 
 
 
 
 
Electric operating revenues
$
1,035,913

 
$
327,038

 
$
—

 
$
1,362,951

Cost of energy
299,714

 
80,882

 
—

 
380,596

Utility margin
736,199

 
246,156

 
—

 
982,355

Other operating expenses
414,662

 
93,389

 
(12,791
)
 
495,260

Depreciation and amortization
133,447

 
61,126

 
14,537

 
209,110

Operating income (loss)
188,090

 
91,641

 
(1,746
)
 
277,985

Interest income
10,173

 
—

 
12,120

 
22,293

Other income (deductions)
22,066

 
3,202

 
(1,739
)
 
23,529

Interest charges
(87,469
)
 
(29,335
)
 
(11,829
)
 
(128,633
)
Segment earnings (loss) before income taxes
132,860

 
65,508

 
(3,194
)
 
195,174

Income taxes (benefit)
40,922

 
23,836

 
(1,480
)
 
63,278

Segment earnings (loss)
91,938

 
41,672

 
(1,714
)
 
131,896

Valencia non-controlling interest
(14,519
)
 
—

 
—

 
(14,519
)
Subsidiary preferred stock dividends
(528
)
 
—

 
—

 
(528
)
Segment earnings (loss) attributable to PNMR
$
76,891

 
$
41,672

 
$
(1,714
)
 
$
116,849

 
 
 
 
 
 
 
 
At December 31, 2016:
 
 
 
 
 
 
 
Total Assets
$
4,867,546

 
$
1,383,223

 
$
220,311

 
$
6,471,080

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

2015
PNM
 
TNMP
 
Corporate
and Other
 
PNMR Consolidated
 
 
 
 
 
 
 
 
Electric operating revenues
$
1,131,195

 
$
307,887

 
$
—

 
$
1,439,082

Cost of energy
391,131

 
73,518

 
—

 
464,649

Utility margin
740,064

 
234,369

 
—

 
974,433

Other operating expenses
590,967

 
88,051

 
(14,854
)
 
664,164

Depreciation and amortization
115,717

 
56,285

 
13,917

 
185,919

Operating income
33,380

 
90,033

 
937

 
124,350

Interest income
6,574

 
—

 
(76
)
 
6,498

Other income (deductions)
26,914

 
3,736

 
(485
)
 
30,165

Interest charges
(79,950
)
 
(27,681
)
 
(7,229
)
 
(114,860
)
Segment earnings (loss) before income taxes
(13,082
)
 
66,088

 
(6,853
)
 
46,153

Income taxes (benefit)
(12,758
)
 
24,125

 
3,708

 
15,075

Segment earnings (loss)
(324
)
 
41,963

 
(10,561
)
 
31,078

Valencia non-controlling interest
(14,910
)
 
—

 
—

 
(14,910
)
Subsidiary preferred stock dividends
(528
)
 
—

 
—

 
(528
)
Segment earnings (loss) attributable to PNMR
$
(15,762
)
 
$
41,963

 
$
(10,561
)
 
$
15,640

 
 
 
 
 
 
 
 
At December 31, 2015:
 
 
 
 
 
 
 
Total Assets
$
4,599,344

 
$
1,297,139

 
$
112,845

 
$
6,009,328

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297
Schedule of Major Customers
Three REPs accounted for more than 10% of the electric operating revenues of TNMP, as follows:
 
Year Ended December 31,
 
2017
 
2016
 
2015
REP A
16
%
 
16
%
 
16
%
REP B
11
%
 
11
%
 
13
%
REP C
10
%
 
11
%
 
11
%