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Revenue Recognition (Gathering and Treating Fees) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable			$ 114,304	$ 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	$ 2,600	$ 7,800
Oil and natural gas receivables
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable			$ 81,364	$ 165,275