Revolving Credit Facility (Details) - USD ($) $ in Thousands		Jun. 30, 2020		Mar. 31, 2020	Jul. 23, 2020	Dec. 31, 2019
Line of Credit Facility [Line Items]
Revolving credit facility		$ 193,000				$ 122,500
Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, maximum loan amount		2,500,000
Revolving credit facility, current borrowing base		1,100,000
Revolving credit facility, aggregate lender commitments		1,100,000				1,200,000
Revolving credit facility, dividend restrictions, amount		12,000		$ 50,000
Revolving credit facility	[1]	193,000				122,500
Letters of credit		42,000	[2]			0
Available borrowing capacity		865,000				1,077,500
Revolving Credit Facility, unamortized deferred financing costs		$ 5,000				$ 5,900
Revolving Credit Facility [Member] | Revolving Credit Facility [Member] | Subsequent Event [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, aggregate lender commitments					$ 1,100,000
Revolving credit facility					180,000
Letters of credit	[2]				42,000
Available borrowing capacity					$ 878,000
Borrowing Base Utilization Of Less Than 25 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, unused capacity, commitment fee rate		0.375%
Borrowing Base Utilization Of 25 Percent Or More But Less Than 50 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, unused capacity, commitment fee rate		0.375%
Borrowing Base Utilization Of 50 Percent Or More But Less Than 75 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, unused capacity, commitment fee rate		0.50%
Borrowing Base Utilization Of 75 Percent Or More But Less Than 90 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, unused capacity, commitment fee rate		0.50%
Borrowing Base Utilization Of 90 Percent Or More [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, unused capacity, commitment fee rate		0.50%
Eurodollar [Member] | Borrowing Base Utilization Of Less Than 25 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	[3]	1.75%
Eurodollar [Member] | Borrowing Base Utilization Of 25 Percent Or More But Less Than 50 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	[3]	2.00%
Eurodollar [Member] | Borrowing Base Utilization Of 50 Percent Or More But Less Than 75 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	[3]	2.50%
Eurodollar [Member] | Borrowing Base Utilization Of 75 Percent Or More But Less Than 90 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	[3]	2.75%
Eurodollar [Member] | Borrowing Base Utilization Of 90 Percent Or More [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate	[3]	3.00%
Prime Rate [Member] | Borrowing Base Utilization Of Less Than 25 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate		0.75%
Prime Rate [Member] | Borrowing Base Utilization Of 25 Percent Or More But Less Than 50 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate		1.00%
Prime Rate [Member] | Borrowing Base Utilization Of 50 Percent Or More But Less Than 75 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate		1.50%
Prime Rate [Member] | Borrowing Base Utilization Of 75 Percent Or More But Less Than 90 Percent [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate		1.75%
Prime Rate [Member] | Borrowing Base Utilization Of 90 Percent Or More [Member] | Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Revolving credit facility, basis spread on variable rate		2.00%

[1] ⁽¹⁾ Unamortized deferred financing costs attributable to the revolving credit facility are presented as a component of the other noncurrent assets line item on the accompanying balance sheets and totaled $5.0 million and $5.9 million as of June 30, 2020, and December 31, 2019, respectively. These costs are being amortized over the term of the revolving credit facility on a straight-line basis.

[2] 2) Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis.

[3] ⁽¹⁾ The Credit Agreement specifies that if LIBOR is no longer a widely used benchmark rate, or if it is no longer used for determining interest rates for loans in the United States, a replacement interest rate that fairly reflects the cost to the lenders of funding loans shall be established by the Administrative Agent, as defined in the Credit Agreement, in consultation with the Company. Please refer to Note 1 - Summary of Significant Accounting Policies for discussion of FASB ASU 2020-04, which provides guidance related to reference rate reform.