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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2016
Segment Reporting [Abstract]  
Summary of Segments
PNMR SEGMENT INFORMATION
 
2016
PNM
 
TNMP
 
Corporate
and Other
 
Consolidated
 
(In thousands)
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
 
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


2014
PNM
 
TNMP
 
Corporate
and Other
 
Consolidated
 
 
 
 
 
 
 
 
Electric operating revenues
$
1,147,914

 
$
287,939

 
$
—

 
$
1,435,853

Cost of energy
403,626

 
67,930

 
—

 
471,556

Utility margin
744,288

 
220,009

 
—

 
964,297

Other operating expenses
422,051

 
84,365

 
(14,450
)
 
491,966

Depreciation and amortization
109,524

 
50,056

 
13,054

 
172,634

Operating income
212,713

 
85,588

 
1,396

 
299,697

Interest income
8,557

 
—

 
(74
)
 
8,483

Other income (deductions)
12,258

 
2,138

 
(2,302
)
 
12,094

Interest charges
(79,442
)
 
(27,396
)
 
(12,789
)
 
(119,627
)
Segment earnings (loss) before income taxes
154,086

 
60,330

 
(13,769
)
 
200,647

Income taxes (benefit)
52,633

 
22,523

 
(5,418
)
 
69,738

Segment earnings (loss)
101,453

 
37,807

 
(8,351
)
 
130,909

Valencia non-controlling interest
(14,127
)
 
—

 
—

 
(14,127
)
Subsidiary preferred stock dividends
(528
)
 
—

 
—

 
(528
)
Segment earnings (loss) attributable to PNMR
$
86,798

 
$
37,807

 
$
(8,351
)
 
$
116,254

 
 
 
 
 
 
 
 
At December 31, 2014:
 
 
 
 
 
 
 
Total Assets
$
4,453,114

 
$
1,229,417

 
$
107,706

 
$
5,790,237

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,
 
2016
 
2015
 
2014
REP A
16
%
 
16
%
 
15
%
REP B
11
%
 
13
%
 
15
%
REP C
11
%
 
11
%
 
11
%