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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31, 2018
 
 
 
 
 
 
 
Electric operating revenues
$
236,232

 
$
81,646

 
$
—

 
$
317,878

Cost of energy
70,802

 
21,754

 
—

 
92,556

Utility margin
165,430

 
59,892

 
—

 
225,322

Other operating expenses
100,511

 
24,973

 
(5,016
)
 
120,468

Depreciation and amortization
36,627

 
16,387

 
5,708

 
58,722

Operating income (loss)
28,292

 
18,532

 
(692
)
 
46,132

Interest income
2,487

 
—

 
1,637

 
4,124

Other income (deductions)
1,217

 
1,085

 
79

 
2,381

Interest charges
(20,830
)
 
(7,729
)
 
(4,496
)
 
(33,055
)
Segment earnings (loss) before income taxes
11,166

 
11,888

 
(3,472
)
 
19,582

Income taxes (benefit)
(348
)
 
2,475

 
(1,344
)
 
783

Segment earnings (loss)
11,514

 
9,413

 
(2,128
)
 
18,799

Valencia non-controlling interest
(3,677
)
 
—

 
—

 
(3,677
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
7,705

 
$
9,413

 
$
(2,128
)
 
$
14,990

 
 
 
 
 
 
 
 
At March 31, 2018:
 
 
 
 
 
 
 
Total Assets
$
4,925,741

 
$
1,526,434

 
$
224,218

 
$
6,676,393

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

 
PNM
 
TNMP
 
Corporate
and Other
 
Consolidated
 
(In thousands)
Three Months Ended March 31, 2017
 
 
 
 
 
 
 
Electric operating revenues
$
251,558

 
$
78,620

 
$
—

 
$
330,178

Cost of energy
81,317

 
21,487

 
—

 
102,804

Utility margin
170,241

 
57,133

 
—

 
227,374

Other operating expenses
93,756

 
23,797

 
(4,660
)
 
112,893

Depreciation and amortization
36,016

 
15,371

 
4,996

 
56,383

Operating income (loss)
40,469

 
17,965

 
(336
)
 
58,098

Interest income
2,816

 
—

 
2,065

 
4,881

Other income (deductions)
5,545

 
732

 
(335
)
 
5,942

Interest charges
(21,012
)
 
(7,404
)
 
(3,284
)
 
(31,700
)
Segment earnings (loss) before income taxes
27,818

 
11,293

 
(1,890
)
 
37,221

Income taxes (benefit)
7,708

 
3,689

 
(622
)
 
10,775

Segment earnings (loss)
20,110

 
7,604

 
(1,268
)
 
26,446

Valencia non-controlling interest
(3,452
)
 
—

 
—

 
(3,452
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
16,526

 
$
7,604

 
$
(1,268
)
 
$
22,862

 
 
 
 
 
 
 
 
At March 31, 2017:
 
 
 
 
 
 
 
Total Assets
$
4,870,201

 
$
1,396,055

 
$
211,423

 
$
6,477,679

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297