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Revenue Recognition (Gathering and Treating Fees) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable			$ 97,607	$ 210,999
Natural Gas, Gathering and Treating Fees \| Natural Gas Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of goods and services sold	$ 2,800	$ 5,200
Oil and natural gas receivables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable			$ 74,555	$ 165,275