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Fair Value Measurements and Disclosures (Tables)
 9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Our crude oil and natural gas fixed-price swaps are included in Level 2. Our collars and propane fixed-price swaps are included in Level 3. Our basis swaps are included in Level 2 and Level 3. The following table presents, for each applicable level within the fair value hierarchy, our derivative assets and liabilities, including both current and non-current portions, measured at fair value on a recurring basis:

 
September 30, 2017
 
December 31, 2016
 
Significant Other
Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
  
Total
 
Significant Other
Observable
Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
  
Total
 
(in thousands)
Assets:
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
24,553

 
$
2,968

 
$
27,521

 
$
6,350

 
$
4,827

 
$
11,177

Total liabilities
(23,811
)
 
(9,437
)
 
(33,248
)
 
(66,789
)
 
(14,401
)
 
(81,190
)
Net asset (liability)
$
742

 
$
(6,469
)
 
$
(5,727
)
 
$
(60,439
)
 
$
(9,574
)
 
$
(70,013
)
 
 
 
 
 
 
 
 
 
 
 
 
Fair Value Assets and Liabilities Unobservable Input Reconciliation
The following table presents a reconciliation of our Level 3 assets measured at fair value:

 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2017
 
2016
 
2017
 
2016
 
 
(in thousands)
Fair value of Level 3 instruments, net asset (liability) beginning of period
 
$
8,619

 
$
27,375

 
$
(9,574
)
 
$
91,288

Changes in fair value included in condensed consolidated statement of operations line item:
 
 
 
 
 
 
 
 
Commodity price risk management gain (loss), net
 
(14,075
)
 
4,234

 
8,547

 
(16,023
)
Settlements included in condensed consolidated statement of operations line items:
 
 
 
 
 
 
 
 
Commodity price risk management gain (loss), net
 
(1,013
)
 
(15,587
)
 
(5,442
)
 
(59,243
)
Fair value of Level 3 instruments, net asset end of period
 
$
(6,469
)
 
$
16,022

 
$
(6,469
)
 
$
16,022

 
 
 
 
 
 
 
 
 
Net change in fair value of Level 3 unsettled derivatives included in condensed consolidated statement of operations line item:
 
 
 
 
 
 
 
 
Commodity price risk management gain (loss), net
 
$
(8,711
)
 
$
(2,240
)
 
$
(583
)
 
$
(8,273
)