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Business Segment Information:
 3 Months Ended
Mar. 31, 2019
Segment Reporting Information, Additional Information [Abstract]  
Business Segment Information BUSINESS SEGMENT INFORMATION

Our reportable segments are based on our method of internal reporting, which is generally segregated by differences in products, services and regulation.

As disclosed in Note 1, changes to our segment performance measure resulted in a revision of the Company’s segment disclosures for all periods to adjust revenues, operating income, and assets related to the power sales arrangement between Colorado IPP and Colorado Electric from being accounted for as a capital lease to being accounted for as an executory contract on an accrual basis. This change had no effect on our consolidated revenues, operating income, or total assets. See below for more information.

Segment information and Corporate and Other is as follows (in thousands):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2019
External Operating
Revenue
 
Inter-company Operating Revenue
 
Total Revenues
 Contract Customers
 Other Revenues
 Contract Customers
 Other Revenues
Segment:
 
 
 
 
 
 
 
Electric Utilities
$
176,663

$
254

 
$
6,010

$
—

 
$
182,927

Gas Utilities (a)
411,500

(1,119
)
 
699

—

 
411,080

Power Generation (b)
2,257

436

 
13,212

9,340

 
25,245

Mining
7,550

269

 
8,279

331

 
16,429

Corporate and Other
—

—

 
—

—

 
—

Inter-company eliminations (b)
—

—

 
(28,200
)
(9,671
)
 
(37,871
)
Total
$
597,970

$
(160
)
 
$
—

$
—

 
$
597,810

 
 
 
 
 
 
 
 
Three Months Ended March 31, 2018
External Operating Revenue
 
Inter-company Operating Revenue
 
 Total Revenues
 Contract Customers
 Other Revenues
 Contract Customers
 Other Revenues
Segment:
 
 
 
 
 
 
 
Electric Utilities
$
167,178

$
233

 
$
6,144

$
—

 
$
173,555

Gas Utilities (a)
395,742

1,184

 
418

—

 
397,344

Power Generation (b)
1,720

371

 
13,049

8,799

 
23,939

Mining
8,715

246

 
7,842

325

 
17,128

Corporate and Other
—

—

 
—

—

 
—

Inter-company eliminations (b)
—

—

 
(27,453
)
(9,124
)
 
(36,577
)
Total
$
573,355

$
2,034

 
$
—

$
—

 
$
575,389



(a)
Other revenues in the Gas Utilities segment include alternative revenue programs related to weather normalization mechanisms for Arkansas Gas and Kansas Gas that are considered out of scope for ASC 606.
(b)
Due to changes to our segment performance measure, Power Generation Inter-company Operating Revenue for Contract Customers was recast for the three months ended March 31, 2018 which resulted in a change of $0.8 million. For the three months ended March 31, 2019, the impact to Power Generation Inter-company Operating Revenue for Contract Customers was $3.4 million. The changes to Power Generation were offset by changes to Inter-company eliminations and there was no impact on our consolidated Total revenues.
 
 
 
 
Three Months Ended March 31,
 
2019
2018
Adjusted operating income:
 
 
Electric Utilities (a)
$
41,020

$
38,480

Gas Utilities
103,314

95,443

Power Generation (a)
11,967

11,776

Mining
4,337

4,271

Corporate and Other (a)
(507
)
(1,696
)
Operating income
160,131

148,274

 
 
 
Interest expense, net
(34,717
)
(34,995
)
Other income (expense), net
(789
)
(104
)
Income tax benefit (expense) (b)
(17,263
)
25,802

Income from continuing operations
107,362

138,977

Net (loss) from discontinued operations
—

(2,343
)
Net income
107,362

136,634

Net income attributable to noncontrolling interest
(3,554
)
(3,630
)
Net income available for common stock
$
103,808

$
133,004

___________
(a)
Due to changes to our segment performance measure, Adjusted operating income was recast for the three months ended March 31, 2018, for Electric Utilities, Power Generation, and Corporate and Other which resulted in changes of $1.7 million, ($1.6) million, and ($0.1) million, respectively. The impact to Adjusted operating income for the three months ended March 31, 2019, for Electric Utilities, Power Generation, and Corporate and Other was ($5.4) million, $0.7 million, and $4.7 million, respectively. There was no impact on our consolidated Operating income.
(b)
Income tax benefit (expense) for the three months ended March 31, 2018 included a $49 million tax benefit resulting from legal entity restructuring. See Note 18 for more information.


Segment information and Corporate and Other balances included in the accompanying Condensed Consolidated Balance Sheets were as follows (in thousands):
Total Assets (net of inter-company eliminations) as of:
March 31, 2019
 
December 31, 2018
 
March 31, 2018
Segment:
 
 
 
 
 
Electric Utilities (a)
$
2,755,056

 
$
2,707,695

 
$
2,629,267

Gas Utilities
3,639,430

 
3,623,475

 
3,398,473

Power Generation (a)
372,503

 
342,085

 
314,764

Mining
63,088

 
80,594

 
65,568

Corporate and Other
207,495

 
209,478

 
194,193

Discontinued operations
—

 
—

 
24,724

Total assets
$
7,037,572

 
$
6,963,327

 
$
6,626,989


___________
(a)
Due to changes to our segment performance measure, Electric Utilities Total assets were recast as of December 31, 2018 and March 31, 2018 which resulted in changes of ($188) million and ($261) million, respectively. Power Generation Total Assets were recast as of December 31, 2018, and March 31, 2018 which resulted in changes of $188 million and $261 million, respectively. The impact to Electric Utilities and Power Generation Total Assets as of March 31, 2019, was ($186) million and $186 million, respectively. There was no impact on our consolidated Total assets.