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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2014
Segment Reporting [Abstract]  
Schedule of Segment Reporting 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
Three Months Ended March 31, 2014
(In thousands)
Electric operating revenues
$
262,736

 
$
66,161

 
$
—

 
$
328,897

Cost of energy
96,626

 
15,988

 
—

 
112,614

Margin
166,110

 
50,173

 
—

 
216,283

Other operating expenses
107,724

 
21,069

 
(3,228
)
 
125,565

Depreciation and amortization
27,082

 
11,842

 
3,041

 
41,965

Operating income
31,304

 
17,262

 
187

 
48,753

Interest income
2,128

 
—

 
(11
)
 
2,117

Other income (deductions)
1,668

 
189

 
(641
)
 
1,216

Net interest charges
(19,812
)
 
(6,598
)
 
(3,125
)
 
(29,535
)
Segment earnings (loss) before income taxes
15,288

 
10,853

 
(3,590
)
 
22,551

Income taxes (benefit)
4,083

 
4,050

 
(1,713
)
 
6,420

Segment earnings (loss)
11,205

 
6,803

 
(1,877
)
 
16,131

Valencia non-controlling interest
(3,531
)
 
—

 
—

 
(3,531
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
7,542

 
$
6,803

 
$
(1,877
)
 
$
12,468

 
 
 
 
 
 
 
 
At March 31, 2014:
 
 
 
 
 
 
 
Total Assets
$
4,219,635

 
$
1,173,028

 
$
114,363

 
$
5,507,026

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297

 
PNM
 
TNMP
 
Corporate
and Other
 
Consolidated
Three Months Ended March 31, 2013
(In thousands)
Electric operating revenues
$
257,894

 
$
59,771

 
$
—

 
$
317,665

Cost of energy
91,660

 
13,046

 
—

 
104,706

Margin
166,234

 
46,725

 
—

 
212,959

Other operating expenses
103,161

 
21,990

 
(3,703
)
 
121,448

Depreciation and amortization
25,834

 
11,681

 
3,292

 
40,807

Operating income
37,239

 
13,054

 
411

 
50,704

Interest income
2,673

 
—

 
(39
)
 
2,634

Other income (deductions)
1,407

 
208

 
(1,725
)
 
(110
)
Net interest charges
(19,957
)
 
(7,246
)
 
(4,094
)
 
(31,297
)
Segment earnings (loss) before income taxes
21,362

 
6,016

 
(5,447
)
 
21,931

Income taxes (benefit)
6,589

 
2,290

 
(910
)
 
7,969

Segment earnings (loss)
14,773

 
3,726

 
(4,537
)
 
13,962

Valencia non-controlling interest
(3,204
)
 
—

 
—

 
(3,204
)
Subsidiary preferred stock dividends
(132
)
 
—

 
—

 
(132
)
Segment earnings (loss) attributable to PNMR
$
11,437

 
$
3,726

 
$
(4,537
)
 
$
10,626

 
 
 
 
 
 
 
 
At March 31, 2013:
 
 
 
 
 
 
 
Total Assets
$
4,155,257

 
$
1,098,942

 
$
116,561

 
$
5,370,760

Goodwill
$
51,632

 
$
226,665

 
$
—

 
$
278,297