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Segment Information (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2016
 
Electric operating revenues
$
235,606

 
$
75,355

 
$
—

 
$
310,961

Cost of energy
72,444

 
19,925

 
—

 
92,369

Utility margin
163,162

 
55,430

 
—

 
218,592

Other operating expenses
108,001

 
22,368

 
(3,114
)
 
127,255

Depreciation and amortization
31,864

 
14,508

 
3,457

 
49,829

Operating income
23,297

 
18,554

 
(343
)
 
41,508

Interest income
1,522

 
—

 
2,100

 
3,622

Other income (deductions)
7,943

 
608

 
(1,068
)
 
7,483

Net interest charges
(21,591
)
 
(7,369
)
 
(2,531
)
 
(31,491
)
Segment earnings (loss) before income taxes
11,171

 
11,793

 
(1,842
)
 
21,122

Income taxes
3,610

 
4,337

 
(790
)
 
7,157

Segment earnings (loss)
7,561

 
7,456

 
(1,052
)
 
13,965

Valencia non-controlling interest
(3,287
)
 
—

 
—

 
(3,287
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
4,142

 
$
7,456

 
$
(1,052
)
 
$
10,546

 
 
 
 
 
 
 
 
At March 31, 2016:
 
 
 
 
 
 
 
Total Assets
$
4,719,346

 
$
1,312,402

 
$
242,064

 
$
6,273,812

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

 
PNM
 
TNMP
 
Corporate
and Other
 
Consolidated
 
(In thousands)
Three Months Ended March 31, 2015
 
 
 
 
 
 
 
Electric operating revenues
$
261,940

 
$
70,928

 
$
—

 
$
332,868

Cost of energy
97,866

 
17,779

 
—

 
115,645

Utility margin
164,074

 
53,149

 
—

 
217,223

Other operating expenses
104,016

 
21,760

 
(3,583
)
 
122,193

Depreciation and amortization
28,403

 
13,458

 
3,600

 
45,461

Operating income
31,655

 
17,931

 
(17
)
 
49,569

Interest income
1,771

 
—

 
(21
)
 
1,750

Other income (deductions)
5,810

 
1,291

 
(1,778
)
 
5,323

Net interest charges
(19,959
)
 
(6,925
)
 
(3,389
)
 
(30,273
)
Segment earnings (loss) before income taxes
19,277

 
12,297

 
(5,205
)
 
26,369

Income taxes (benefit)
5,775

 
4,603

 
(1,861
)
 
8,517

Segment earnings (loss)
13,502

 
7,694

 
(3,344
)
 
17,852

Valencia non-controlling interest
(3,380
)
 
—

 
—

 
(3,380
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
9,990

 
$
7,694

 
$
(3,344
)
 
$
14,340

 
 
 
 
 
 
 
 
At March 31, 2015:
 
 
 
 
 
 
 
Total Assets
$
4,444,290

 
$
1,232,687

 
$
223,629

 
$
5,900,606

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297