Commitments and Contingencies Long-term fIrm transportation costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Transportation, gathering and processing expenses	$ 46,353	$ 37,403	$ 33,220
LT transportation volumes, net to interest	50,100		$ 10,000
Utica Shale natural gas and Wattenberg Field crude oil [Member]
Loss Contingencies [Line Items]
Transportation, gathering and processing expenses	$ 1,600