Price-Risk Management Price-Risk Management (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) MMBTU bbl $ / MMBTU $ / Boe	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) MMBTU bbl $ / MMBTU $ / Boe	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Price Risk Derivatives, Net | $	$ (8,500)	$ 25,000	$ 79,800	$ 20,900
Cash Received (Paid) On Settlements of Derivative Contracts | $			67,496	$ 4,381
Cash Received (Paid) On Monetized Derivative Contracts | $			38,300
Receivables for Settled Derivatives | $	4,700		4,700		$ 2,900
Payables for Settled Derivatives | $	100		100		200
Derivative, Fair Value, Net | $	18,800		18,800		8,400
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset | $	20,800		20,800		12,800
Other Noncurrent Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset | $	4,700		4,700		3,900
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability | $	4,200		4,200		6,600
Other Noncurrent Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability | $	$ 2,400		$ 2,400		$ 1,600
Swap [Member] | Oil Derivative Swaps [Member] | Third Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	354,338		354,338
Derivative, Swap Type, Fixed Price | $ / Boe	50.30		50.30
Swap [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	353,626		353,626
Derivative, Swap Type, Fixed Price | $ / Boe	47.72		47.72
Swap [Member] | Oil Derivative Swaps [Member] | First Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	215,538		215,538
Derivative, Swap Type, Fixed Price | $ / Boe	51.93		51.93
Swap [Member] | Oil Derivative Swaps [Member] | Second Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	195,646		195,646
Derivative, Swap Type, Fixed Price | $ / Boe	51.93		51.93
Swap [Member] | Oil Derivative Swaps [Member] | Third Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	179,759		179,759
Derivative, Swap Type, Fixed Price | $ / Boe	51.19		51.19
Swap [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	163,812		163,812
Derivative, Swap Type, Fixed Price | $ / Boe	52.39		52.39
Swap [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	7,575,000		7,575,000
Derivative, Swap Type, Fixed Price	2.60		2.60
Swap [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	7,817,000		7,817,000
Derivative, Swap Type, Fixed Price	2.63		2.63
Swap [Member] | Natural Gas Derivative Swaps [Member] | First Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	2,398,078		2,398,078
Derivative, Swap Type, Fixed Price	2.74		2.74
Swap [Member] | Natural Gas Derivative Swaps [Member] | Second Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	832,255		832,255
Derivative, Swap Type, Fixed Price	2.42		2.42
Swap [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	640,000		640,000
Derivative, Swap Type, Fixed Price	2.26		2.26
Swap [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	290,000		290,000
Derivative, Swap Type, Fixed Price	2.69		2.69
Swap [Member] | Natural Gas Liquids | Third Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	35,119		35,119
Derivative, Swap Type, Fixed Price	12.50		12.50
Collar Contracts [Member] | Oil Derivative Swaps [Member] | Third Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	62,350		62,350
Derivative, Average Floor Price	30.00		30.00
Derivative, Average Cap Price	35.38		35.38
Collar Contracts [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	115,000		115,000
Derivative, Average Floor Price	31.00		31.00
Derivative, Average Cap Price	36.15		36.15
Collar Contracts [Member] | Oil Derivative Swaps [Member] | First Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	161,475		161,475
Derivative, Average Floor Price	34.29		34.29
Derivative, Average Cap Price	39.36		39.36
Collar Contracts [Member] | Oil Derivative Swaps [Member] | Second Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	136,230		136,230
Derivative, Average Floor Price	34.92		34.92
Derivative, Average Cap Price	40.68		40.68
Collar Contracts [Member] | Oil Derivative Swaps [Member] | Third Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	90,620		90,620
Derivative, Average Floor Price	34.34		34.34
Derivative, Average Cap Price	39.87		39.87
Collar Contracts [Member] | Oil Derivative Swaps [Member] | Fourth Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	84,640		84,640
Derivative, Average Floor Price	34.70		34.70
Derivative, Average Cap Price	41.01		41.01
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	310,000		310,000
Derivative, Average Floor Price	2.60		2.60
Derivative, Average Cap Price	3.06		3.06
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | First Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	7,027,800		7,027,800
Derivative, Average Floor Price	2.53		2.53
Derivative, Average Cap Price	3.33		3.33
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Second Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	4,546,000		4,546,000
Derivative, Average Floor Price	2.18		2.18
Derivative, Average Cap Price	2.69		2.69
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Third Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	4,665,175		4,665,175
Derivative, Average Floor Price	2.02		2.02
Derivative, Average Cap Price	2.65		2.65
Collar Contracts [Member] | Natural Gas Derivative Swaps [Member] | Fourth Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	4,391,000		4,391,000
Derivative, Average Floor Price	2.25		2.25
Derivative, Average Cap Price	2.71		2.71
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Third Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	11,868,000		11,868,000
Derivative, Swap Type, Fixed Price	(0.07)		(0.07)
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Fourth Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	11,868,000		11,868,000
Derivative, Swap Type, Fixed Price	(0.04)		(0.04)
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | First Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	8,100,000		8,100,000
Derivative, Swap Type, Fixed Price	(0.01)		(0.01)
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Second Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	8,190,000		8,190,000
Derivative, Swap Type, Fixed Price	(0.01)		(0.01)
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Third Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	8,280,000		8,280,000
Derivative, Swap Type, Fixed Price	(0.01)		(0.01)
Basis Swap [Member] | Natural Gas Basis Derivative Swaps [Member] | Fourth Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | MMBTU	8,280,000		8,280,000
Derivative, Swap Type, Fixed Price	(0.01)		(0.01)
Basis Swap [Member] | Oil Basis Derivative [Member] | Third Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	821,525		821,525
Derivative, Swap Type, Fixed Price	1.43		1.43
Basis Swap [Member] | Oil Basis Derivative [Member] | Fourth Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	935,175		935,175
Derivative, Swap Type, Fixed Price	0.59		0.59
Basis Swap [Member] | Oil Basis Derivative [Member] | First Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	749,750		749,750
Derivative, Swap Type, Fixed Price	0.41		0.41
Basis Swap [Member] | Oil Basis Derivative [Member] | Second Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	634,050		634,050
Derivative, Swap Type, Fixed Price	0.43		0.43
Basis Swap [Member] | Oil Basis Derivative [Member] | Third Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	515,200		515,200
Derivative, Swap Type, Fixed Price	0.48		0.48
Basis Swap [Member] | Oil Basis Derivative [Member] | Fourth Quarter 2021 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes | bbl	483,000		483,000
Derivative, Swap Type, Fixed Price	0.47		0.47