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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2017
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, 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
95,894

 
23,797

 
(4,660
)
 
115,031

Depreciation and amortization
36,016

 
15,371

 
4,996

 
56,383

Operating income (loss)
38,331

 
17,965

 
(336
)
 
55,960

Interest income
2,816

 
—

 
2,065

 
4,881

Other income (deductions)
7,683

 
732

 
(335
)
 
8,080

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

 
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 (loss)
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

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 (benefit)
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