Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Revenue Recognition (Gathering and Treating Fees) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Accounts Receivable
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with customer, asset, gross, current	$ 98,568		$ 87,061
Natural Gas, Gathering and Treating Fees \| Natural Gas Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of goods and services sold	$ 2,408
Natural Gas, Gathering and Treating Fees \| Lease Operating Expense
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cost of goods and services sold		$ 1,252