Other Accrued Expenses Deferred Midstream Gathering Credits (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Deferred Midstream Gathering Credits [Line Items]
Amortization of Other Deferred Charges	$ 500		$ 1,500
Midstream Oil Gathering
Deferred Midstream Gathering Credits [Line Items]
Amortization of Other Deferred Charges	0	$ 201	368	$ 259
Midstream Gas Gathering
Deferred Midstream Gathering Credits [Line Items]
Amortization of Other Deferred Charges	1,535	711	2,991	914
Midstream Water Gathering
Deferred Midstream Gathering Credits [Line Items]
Amortization of Other Deferred Charges	$ 686	$ 373	$ 1,458	$ 557