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Revenue Recognition (Tables)
 3 Months Ended
Mar. 31, 2018
Revenue Recognition and Deferred Revenue [Abstract]  
Capitalized Contract Cost [Table Text Block]
The following table presents the changes in carrying amounts of the contract assets associated with our crude oil, natural gas, and NGLs sales revenue for the three months ended March 31, 2018:
 
Amount
 
(in thousands)
 
 
Beginning balance, January 1, 2018
$
4,446

Contract assets amortized as a reduction to crude oil, natural gas, and NGLs sales
(1,233
)
Ending balance, March 31, 2018
$
3,213
Disaggregation of Revenue [Table Text Block]
Disaggregated Revenue. The following table presents crude oil, natural gas, and NGLs sales disaggregated by commodity and operating region for the three months ended March 31, 2018 and 2017 (in thousands):

 
 
Three Months Ended March 31,
Revenue by Commodity and Operating Region
 
2018
 
2017 (2)
 
Percentage Change
Crude oil
 
 
 
 
 
 
Wattenberg Field
 
$
170,306

 
$
105,188

 
61.9
 %
Delaware Basin
 
53,418

 
13,538

 
294.6
 %
Utica Shale (1)
 
2,696

 
4,270

 
(36.9
)%
Total
 
$
226,420

 
$
122,996

 
84.1
 %
 Natural gas
 
 
 
 
 
 
Wattenberg Field
 
$
29,772

 
$
32,614

 
(8.7
)%
Delaware Basin
 
7,679

 
2,468

 
211.1
 %
Utica Shale (1)
 
1,110

 
1,860

 
(40.3
)%
Total
 
$
38,561

 
$
36,942

 
4.4
 %
NGLs
 
 
 
 
 
 
Wattenberg Field
 
$
28,770

 
$
25,318

 
13.6
 %
Delaware Basin
 
10,635

 
2,947

 
260.9
 %
Utica Shale (1)
 
839

 
1,489

 
(43.7
)%
Total
 
$
40,244

 
$
29,754

 
35.3
 %
Revenue by Operating Region
 
 
 
 
 
 
Wattenberg Field
 
$
228,848

 
$
163,120

 
40.3
 %
Delaware Basin
 
71,732

 
18,953

 
278.5
 %
Utica Shale (1)
 
4,645

 
7,619

 
(39.0
)%
Total
 
$
305,225

 
$
189,692

 
60.9
 %
________________
(1) In March 2018, we completed the sale of our Utica Shale properties.
(2) As we have elected the modified retrospective method of adoption, revenues for the three months ended
March 31, 2017 have not been restated for the new revenue recognition standard. Such amounts would not
have been material.