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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2018
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.
 
2018
PNM
 
TNMP
 
Corporate
and Other
 
PNMR Consolidated
 
(In thousands)
Electric operating revenues
$
1,091,965

 
$
344,648

 
$
—

 
$
1,436,613

Cost of energy
314,036

 
85,690

 
—

 
399,726

Utility margin
777,929

 
258,958

 
—

 
1,036,887

Other operating expenses
481,030

 
96,272

 
(17,650
)
 
559,652

Depreciation and amortization
151,866

 
66,189

 
23,133

 
241,188

Operating income (loss)
145,033

 
96,497

 
(5,483
)
 
236,047

Interest income
13,089

 
—

 
2,451

 
15,540

Other income (deductions)
(17,312
)
 
4,065

 
(2,039
)
 
(15,286
)
Interest charges
(76,458
)
 
(32,091
)
 
(18,695
)
 
(127,244
)
Segment earnings (loss) before income taxes
64,352

 
68,471

 
(23,766
)
 
109,057

Income taxes (benefit)
(5,971
)
 
16,880

 
(3,134
)
 
7,775

Segment earnings (loss)
70,323

 
51,591

 
(20,632
)
 
101,282

Valencia non-controlling interest
(15,112
)
 
—

 
—

 
(15,112
)
Subsidiary preferred stock dividends
(528
)
 
—

 
—

 
(528
)
Segment earnings (loss) attributable to PNMR
$
54,683

 
$
51,591

 
$
(20,632
)
 
$
85,642

 
 
 
 
 
 
 
 
At December 31, 2018:
 
 
 
 
 
 
 
Total Assets
$
5,035,883

 
$
1,665,177

 
$
164,491

 
$
6,865,551

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

2017
PNM
 
TNMP
 
Corporate
and Other
 
PNMR Consolidated
 
 
 
 
 
 
 
 
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
414,457

 
98,221

 
(22,135
)
 
490,543

Depreciation and amortization
147,017

 
63,146

 
21,779

 
231,942

Operating income
221,079

 
93,604

 
356

 
315,039

Interest income
8,454

 
—

 
7,462

 
15,916

Other income (deductions)
22,132

 
3,551

 
(3,254
)
 
22,429

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
407,922

 
93,389

 
(12,791
)
 
488,520

Depreciation and amortization
133,447

 
61,126

 
14,537

 
209,110

Operating income (loss)
194,830

 
91,641

 
(1,746
)
 
284,725

Interest income
10,173

 
—

 
12,120

 
22,293

Other income (deductions)
15,326

 
3,202

 
(1,739
)
 
16,789

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
Schedule of Major Customers
Three REPs accounted for more than 10% of the electric operating revenues of TNMP, as follows:
 
Year Ended December 31,
 
2018
 
2017
 
2016
REP A
21
%
 
16
%
 
16
%
REP B
15
%
 
11
%
 
11
%
REP C
12
%
 
10
%
 
11
%