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Revenue:
 3 Months Ended
Mar. 31, 2019
Revenue from Contract with Customer [Abstract]  
Revenue REVENUE

Revenue Recognition

As of January 1, 2018, we adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606), and its related amendments (collectively known as ASC 606). Revenue is recognized in an amount that reflects the consideration we expect to receive in exchange for goods or services, when control of the promised goods or services is transferred to our customers. The following tables depict the disaggregation of revenue, including intercompany revenue, from contracts with customers by customer type and timing of revenue recognition for each of the reporting segments, for the three months ended March 31, 2019 and 2018. Sales tax and other similar taxes are excluded from revenues.

 
 
 
 
 
 
 

 
 
 
 
 
 
 
Three Months Ended March 31, 2019
 Electric Utilities
 Gas Utilities
 
 Power Generation (a)
 Mining
Inter-company Revenues (a)
Total
Customer types:
(in thousands)
Retail
$
153,463

$
354,275

 
$
—

$
15,829

$
(8,128
)
$
515,439

Transportation
—

44,517

 
—

—

(432
)
44,085

Wholesale
8,343

—

 
15,469

—

(13,213
)
10,599

Market - off-system sales
6,692

217

 
—

—

(2,224
)
4,685

Transmission/Other
14,175

13,190

 
—

—

(4,203
)
23,162

Revenue from contracts with customers
182,673

412,199

 
15,469

15,829

(28,200
)
597,970

Other revenues
254

(1,119
)
(b) 
9,776

600

(9,671
)
(160
)
Total revenues
$
182,927

$
411,080

 
$
25,245

$
16,429

$
(37,871
)
$
597,810

 
 
 
 
 
 
 
 
Timing of revenue recognition:
 
 
 
 
 
 
 
Services transferred at a point in time
$
—

$
—

 
$
—

$
15,829

$
(8,128
)
$
7,701

Services transferred over time
182,673

412,199

 
15,469

—

(20,072
)
590,269

Revenue from contracts with customers
$
182,673

$
412,199

 
$
15,469

$
15,829

$
(28,200
)
$
597,970

 
 
 
 
 
 
 
 




Three Months Ended March 31, 2018
 Electric Utilities
 Gas Utilities
 
 Power Generation (a)
 Mining
Inter-company Revenues (a)
Total
Customer Types:
 
 
 
 
 
 
 
Retail
$
147,057

$
341,394

 
$
—

$
16,557

$
(7,842
)
$
497,166

Transportation
—

41,669

 
—

—

(409
)
41,260

Wholesale
9,050

—

 
14,769

—

(13,049
)
10,770

Market - Off-System Sales
4,144

427

 
—

—

(2,522
)
2,049

Transmission/Other
13,071

12,670

 
—

—

(3,631
)
22,110

Revenue from contracts with customers
$
173,322

$
396,160

 
$
14,769

$
16,557

$
(27,453
)
$
573,355

Other Revenues
233

1,184

(b) 
9,170

571

(9,124
)
2,034

Total Revenues
$
173,555

$
397,344

 
$
23,939

$
17,128

$
(36,577
)
$
575,389

 
 
 
 
 
 
 
 
Timing of Revenue Recognition:
 
 
 
 
 
 
 
Services transferred at a point in time
$
—

$
—

 
$
—

$
16,557

$
(7,842
)
$
8,715

Services transferred over time
173,322

396,160

 
14,769

—

(19,611
)
564,640

Revenue from contracts with customers
$
173,322

$
396,160

 
$
14,769

$
16,557

$
(27,453
)
$
573,355

 
 
 
 
 
 
 
 


(a)
Due to changes to our segment performance measure as disclosed in Note 1, Power Generation Wholesale revenue 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 Wholesale revenue was $3.4 million. The changes to Power Generation were offset by changes to eliminations in Inter-company Revenues and there was no impact to our consolidated Total Revenues.
(b)
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.

Contract Balances

The nature of our primary revenue contracts provides an unconditional right to consideration upon service delivery; therefore, no customer contract assets or liabilities exists. The unconditional right to consideration is represented by the balance in our Accounts Receivable further discussed in Note 4. We do not typically incur costs that would be capitalized to obtain or fulfill a revenue contract.