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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Summary of Financial Information by Segment
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.

PNMR SEGMENT INFORMATION
 
PNM
 
TNMP
 
Corporate
and Other
 
Consolidated
 
(In thousands)
Three Months Ended September 30, 2016
 
Electric operating revenues
$
311,276

 
$
89,098

 
$
—

 
$
400,374

Cost of energy
88,565

 
20,201

 
—

 
108,766

Utility margin
222,711

 
68,897

 
—

 
291,608

Other operating expenses
109,342

 
24,184

 
(3,006
)
 
130,520

Depreciation and amortization
33,312

 
16,354

 
3,351

 
53,017

Operating income (loss)
80,057

 
28,359

 
(345
)
 
108,071

Interest income
1,509

 
—

 
3,095

 
4,604

Other income (deductions)
4,980

 
855

 
(184
)
 
5,651

Interest charges
(22,213
)
 
(7,308
)
 
(2,946
)
 
(32,467
)
Segment earnings (loss) before income taxes
64,333

 
21,906

 
(380
)
 
85,859

Income taxes (benefit)
19,343

 
8,053

 
(93
)
 
27,303

Segment earnings (loss)
44,990

 
13,853

 
(287
)
 
58,556

Valencia non-controlling interest
(4,006
)
 
—

 
—

 
(4,006
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
40,852

 
$
13,853

 
$
(287
)
 
$
54,418

 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2016
 
 
 
 
 
 
 
Electric operating revenues
$
780,228

 
$
246,498

 
$
—

 
$
1,026,726

Cost of energy
222,376

 
60,122

 
—

 
282,498

Utility margin
557,852

 
186,376

 
—

 
744,228

Other operating expenses
314,961

 
70,328

 
(9,261
)
 
376,028

Depreciation and amortization
97,778

 
45,760

 
10,263

 
153,801

Operating income (loss)
145,113

 
70,288

 
(1,002
)
 
214,399

Interest income
8,549

 
—

 
9,871

 
18,420

Other income (deductions)
17,305

 
2,139

 
(1,517
)
 
17,927

Interest charges
(66,494
)
 
(22,150
)
 
(8,535
)
 
(97,179
)
Segment earnings (loss) before income taxes
104,473

 
50,277

 
(1,183
)
 
153,567

Income taxes (benefit)
32,131

 
18,460

 
(497
)
 
50,094

Segment earnings (loss)
72,342

 
31,817

 
(686
)
 
103,473

Valencia non-controlling interest
(11,037
)
 
—

 
—

 
(11,037
)
Subsidiary preferred stock dividends
(396
)
 
—

 
—

 
(396
)
Segment earnings (loss) attributable to PNMR
$
60,909

 
$
31,817

 
$
(686
)
 
$
92,040

 
 
 
 
 
 
 
 
At September 30, 2016:
 
 
 
 
 
 
 
Total Assets
$
4,799,012

 
$
1,366,840

 
$
237,818

 
$
6,403,670

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

 
PNM
 
TNMP
 
Corporate
and Other
 
Consolidated
 
(In thousands)
Three Months Ended September 30, 2015
 
 
 
 
 
 
 
Electric operating revenues
$
333,437

 
$
83,996

 
$
—

 
$
417,433

Cost of energy
105,708

 
18,547

 
—

 
124,255

Utility margin
227,729

 
65,449

 
—

 
293,178

Other operating expenses
104,977

 
22,766

 
(3,573
)
 
124,170

Depreciation and amortization
29,042

 
15,016

 
3,445

 
47,503

Operating income
93,710

 
27,667

 
128

 
121,505

Interest income
1,152

 
—

 
(1
)
 
1,151

Other income (deductions)
5,289

 
672

 
(482
)
 
5,479

Interest charges
(19,837
)
 
(6,855
)
 
(836
)
 
(27,528
)
Segment earnings (loss) before income taxes
80,314

 
21,484

 
(1,191
)
 
100,607

Income taxes (benefit)
27,258

 
7,795

 
699

 
35,752

Segment earnings (loss)
53,056

 
13,689

 
(1,890
)
 
64,855

Valencia non-controlling interest
(3,678
)
 
—

 
—

 
(3,678
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
49,246

 
$
13,689

 
$
(1,890
)
 
$
61,045

 
 
 
 
 
 
 
 
Nine Months Ended September 30, 2015
 
 
 
 
 
 
 
Electric operating revenues
$
870,826

 
$
232,361

 
$
—

 
$
1,103,187

Cost of energy
299,302

 
54,637

 
—

 
353,939

Utility margin
571,524

 
177,724

 
—

 
749,248

Other operating expenses
312,534

 
65,332

 
(11,118
)
 
366,748

Depreciation and amortization
86,446

 
42,065

 
10,502

 
139,013

Operating income
172,544

 
70,327

 
616

 
243,487

Interest income
4,869

 
—

 
(27
)
 
4,842

Other income (deductions)
18,547

 
2,757

 
(2,935
)
 
18,369

Interest charges
(59,477
)
 
(20,636
)
 
(6,601
)
 
(86,714
)
Segment earnings (loss) before income taxes
136,483

 
52,448

 
(8,947
)
 
179,984

Income taxes (benefit)
44,560

 
19,200

 
(2,139
)
 
61,621

Segment earnings (loss)
91,923

 
33,248

 
(6,808
)
 
118,363

Valencia non-controlling interest
(10,909
)
 
—

 
—

 
(10,909
)
Subsidiary preferred stock dividends
(396
)
 
—

 
—

 
(396
)
Segment earnings (loss) attributable to PNMR
$
80,618

 
$
33,248

 
$
(6,808
)
 
$
107,058

 
 
 
 
 
 
 
 
At September 30, 2015:
 
 
 
 
 
 
 
Total Assets
$
4,615,442

 
$
1,282,766

 
$
114,374

 
$
6,012,582

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297