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Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Fair Value Amounts of Derivative Instruments
The following table summarizes the location, as well as the gross and net fair value amounts, of all derivative instruments presented on the Consolidated Balance Sheets as of the dates indicated.

  
 
As of December 31, 2018
Balance Sheet
 
Gross Amounts of
Recognized Assets
 
Gross Amounts
Offset in the Balance
Sheet
 
Net Amounts of
Assets Presented in
the Balance Sheet
 
 
 
 
(in thousands)
 
 
Derivative assets current
 
$
82,205

 
$
(1,039
)
(1) 
$
81,166

Derivative assets non-current
 
27,289

 
—

 
27,289

Total derivative assets
 
$
109,494

 
$
(1,039
)
 
$
108,455

 
 
 
 
 
 
 
 
 
Gross Amounts of
Recognized Liabilities
 
Gross Amounts
Offset in the Balance
Sheet
 
Net Amounts of
Liabilities Presented in
the Balance Sheet
 
 
 
 
(in thousands)
 
 
Derivative liabilities
 
$
(1,039
)
 
$
1,039

(1) 
$
—

Derivatives and other noncurrent liabilities
 
—

 
—

 
—

Total derivative liabilities
 
$
(1,039
)
 
$
1,039

  
$
—

 
 
 
 
 
 
 
  
 
As of December 31, 2017
Balance Sheet
 
Gross Amounts of
Recognized Assets
 
Gross Amounts
Offset in the Balance
Sheet
 
Net Amounts of
Assets Presented in
the Balance Sheet
 
 
 
 
(in thousands)
 
 
Derivative assets current
 
$
594

 
$
(594
)
(1) 
$
—

Derivative assets non-current
 
62

 
(62
)
(1) 
—

Total derivative assets
 
$
656

 
$
(656
)
 
$
—

 
 
 
 
 
 
 
 
 
Gross Amounts of
Recognized Liabilities
 
Gross Amounts
Offset in the Balance
Sheet
 
Net Amounts of
Liabilities Presented in
the Balance Sheet
 
 
 
 
(in thousands)
 
 
Derivative liabilities
 
$
(21,534
)
 
$
594

(1) 
$
(20,940
)
Derivatives and other noncurrent liabilities
 
(4,180
)
 
62

(1) 
(4,118
)
Total derivative liabilities
 
$
(25,714
)
 
$
656

  
$
(25,058
)
 
(1)
Asset and liability balances with the same counterparty are presented as a net asset or liability on the Consolidated Balance Sheets.
Financial Instruments for Hedging Volumes
As of December 31, 2018, the Company had swap contracts in place to hedge the following volumes for the periods indicated:
 
For the Year 2019
 
For the Year 2020
 
Derivative Volumes
 
Weighted Average Price
 
Derivative Volumes
 
Weighted Average Price
Oil (Bbls)
6,704,184

 
$
58.85

 
2,469,000

 
$
60.79

Natural Gas (MMbtu)
3,050,000

 
2.46

 
—

 
—
Cashless Collars [Domain]  
Derivative Instruments and Hedging Activities Disclosures [Line Items]  
Financial Instruments for Hedging Volumes
As of December 31, 2018 , the Company had cashless collars (purchased put options and written call options) in place to hedge the following volumes for the periods indicated:
 
For the Year 2019
 
Derivative Volumes
 
Weighted Average Floor Price
 
Weighted Average Ceiling Price
Oil (Bbls)
552,000

 
$
55.00

 
$
77.56

Natural Gas (MMbtu)
225,000

 
3.25

 
4.45