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Business Segment Information: (Tables)
9 Months Ended
Sep. 30, 2017
Segment Reporting Information, Additional Information [Abstract]  
Segment Reporting
Segment information and Corporate activities included in the accompanying Condensed Consolidated Statements of Income were as follows (in thousands):
Three Months Ended September 30, 2017
 
External
Operating
Revenue
 
Inter-company
Operating
Revenue
 
Net Income (Loss) Available for Common Stock
Segment:
 
 
 
 
 
 
Electric
 
$
181,238

 
$
2,333

 
$
27,324

Gas
 
142,821

 
73

 
(4,329
)
Power Generation (b)
 
1,810

 
21,117

 
6,155

Mining
 
9,742

 
7,751

 
3,477

Oil and Gas
 
6,527

 

 
(2,712
)
Corporate activities (c)
 

 

 
(2,252
)
Inter-company eliminations
 

 
(31,274
)
 

Total
 
$
342,138

 
$

 
$
27,663


Three Months Ended September 30, 2016
 
External
Operating
Revenue
 
Inter-company
Operating
Revenue
 
Net Income (Loss) Available for Common Stock
Segment:
 
 
 
 
 
 
Electric.
 
$
171,754

 
$
2,747

 
$
24,181

Gas
 
141,445

 

 
(2,939
)
Power Generation (b)
 
1,906

 
21,431

 
5,642

Mining
 
9,042

 
7,778

 
3,307

Oil and Gas (e)
 
9,639

 

 
(8,828
)
Corporate activities (c)
 

 

 
(7,232
)
Inter-company eliminations
 

 
(31,956
)
 

Total
 
$
333,786

 
$

 
$
14,131

 
 
 
 
 
 
 
Nine Months Ended September 30, 2017
 
External
Operating
Revenue
 
Inter-company
Operating
Revenue
 
Net Income (Loss) Available for Common Stock
Segment:
 
 
 
 
 
 
Electric
 
$
518,925

 
$
9,123

 
$
68,386

Gas (a)
 
674,161

 
90

 
41,409

Power Generation (b)
 
5,382

 
62,907

 
18,017

Mining
 
26,500

 
22,485

 
9,048

Oil and Gas
 
19,151

 

 
(7,609
)
Corporate activities (c)(d)
 

 

 
(2,870
)
Inter-company eliminations
 

 
(94,605
)
 

Total
 
$
1,244,119

 
$

 
$
126,381

 
 
 
 
 
 
 
Nine Months Ended September 30, 2016
 
External
Operating
Revenue
 
Inter-company
Operating
Revenue
 
Net Income (Loss) Available for Common Stock
Segment:
 
 
 
 
 
 
Electric
 
$
493,845

 
$
9,413

 
$
62,625

Gas (a)
 
563,879

 

 
29,975

Power Generation (b)
 
5,304

 
63,055

 
19,907

Mining
 
20,498

 
23,651

 
6,969

Oil and Gas (e)
 
25,660

 

 
(35,277
)
Corporate activities (c)(d)
 

 

 
(29,397
)
Inter-company eliminations
 

 
(96,119
)
 

Total
 
$
1,109,186

 
$

 
$
54,802


___________
(a)
Gas Utility revenue increased for the nine months ended September 30, 2017 compared to the same period in the prior year primarily due to the addition of the SourceGas utilities on February 12, 2016.
(b)
Net income (loss) available for common stock for the three and nine months ended September 30, 2017 and September 30, 2016 was net of net income attributable to noncontrolling interests of $3.9 million and $11 million, and $3.8 million and $6.4 million, respectively.
(c)
Net income (loss) available for common stock for the three and nine months ended September 30, 2017 and September 30, 2016 included incremental, non-recurring acquisition costs, net of tax of $0.2 million and $1.5 million, and $4.0 million and $24 million respectively. The nine months ended September 30, 2017 and the three and nine months ended September 30, 2016 included $0.4 million, $1.7 million and $7.4 million, respectively, of after-tax internal labor costs attributable to the acquisition.
(d)
Net income (loss) available for common stock for the nine months ended September 30, 2017 included a $1.4 million tax benefit recognized from carryback claims for specified liability losses involving prior tax years. Net income (loss) available for common stock for the nine months ended September 30, 2016 included tax benefits of approximately $4.4 million as a result of the re-measurement of the liability for uncertain tax positions predicated on an agreement reached with IRS Appeals in early 2016. See Note 18.
(e)
Net income (loss) available for common stock for the three and nine months ended September 30, 2016 included non-cash after-tax impairments of oil and gas properties of $7.9 million and $33 million, respectively. See Note 17 to the Condensed Consolidated Financial Statements in this Quarterly Report on Form 10-Q.

Reconciliation of Assets from Segment to Consolidated
Segment information and Corporate balances included in the accompanying Condensed Consolidated Balance Sheets were as follows (in thousands):
Total Assets (net of inter-company eliminations) as of:
September 30, 2017
 
December 31, 2016
 
September 30, 2016
Segment:
 
 
 
 
 
Electric (a)
$
2,911,919

 
$
2,859,559

 
$
2,814,408

Gas
3,288,104

 
3,307,967

 
3,170,571

Power Generation (a)
64,357

 
73,445

 
77,570

Mining
66,700

 
67,347

 
66,804

Oil and Gas (b)
105,963

 
96,435

 
158,981

Corporate activities
114,134

 
110,691

 
132,652

Total assets
$
6,551,177

 
$
6,515,444

 
$
6,420,986


__________
(a)
The PPA under which Black Hills Colorado IPP provides generation to support Colorado Electric customers from the Pueblo Airport Generation Station is accounted for as a capital lease. As such, assets owned by our Power Generation segment are recorded at Colorado Electric under accounting for a capital lease.
(b)
As a result of continued low commodity prices and our decision to divest non-core oil and gas assets, we recorded non-cash impairments of $107 million for the year ended December 31, 2016 and $52 million for the nine months ended September 30, 2016. See Note 17 to the Condensed Consolidated Financial Statements in this Quarterly Report on Form 10-Q.