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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2019
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
 
PNMR Consolidated
 
(In thousands)
Three Months Ended March 31, 2019
 
Electric operating revenues
$
269,318

 
$
80,327

 
$
—

 
$
349,645

Cost of energy
99,339

 
22,287

 
—

 
121,626

Utility margin
169,979

 
58,040

 
—

 
228,019

Other operating expenses
106,462

 
25,241

 
(5,763
)
 
125,940

Depreciation and amortization
39,224

 
20,214

 
5,918

 
65,356

Operating income (loss)
24,293

 
12,585

 
(155
)
 
36,723

Interest income
3,656

 
31

 
(68
)
 
3,619

Other income (deductions)
14,358

 
554

 
(735
)
 
14,177

Interest charges
(18,360
)
 
(8,800
)
 
(4,474
)
 
(31,634
)
Segment earnings (loss) before income taxes
23,947

 
4,370

 
(5,432
)
 
22,885

Income taxes (benefit)
1,973

 
272

 
(1,022
)
 
1,223

Segment earnings (loss)
21,974

 
4,098

 
(4,410
)
 
21,662

Valencia non-controlling interest
(2,830
)
 
—

 
—

 
(2,830
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
19,012

 
$
4,098

 
$
(4,410
)
 
$
18,700

 
 
 
 
 
 
 
 
At March 31, 2019:
 
 
 
 
 
 
 
Total Assets
$
5,202,039

 
$
1,871,780

 
$
176,939

 
$
7,250,758

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

 
PNM
 
TNMP
 
Corporate
and Other
 
PNMR 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