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Price-Risk Management Price-Risk Management (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) bbl MMBTU $ / MMBTU $ / Boe	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) bbl MMBTU $ / MMBTU $ / Boe	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gain (Loss) on Price Risk Derivatives, Net \| $	$ 25,000	$ (10,800)	$ 20,900	$ (17,100)
Cash Received (Paid) On Settlements of Derivative Contracts \| $			4,381	$ (1,935)
Receivables for Settled Derivatives \| $	3,600		3,600		$ 700
Payables for Settled Derivatives \| $	200		200		2,200
Derivative, Fair Value, Net \| $	24,600		24,600		13,000
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset \| $	21,700		21,700		15,300
Other Noncurrent Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset, Fair Value, Gross Asset \| $	5,900		5,900		4,300
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability \| $	2,000		2,000		2,800
Other Noncurrent Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Liability, Fair Value, Gross Liability \| $	$ 1,000		$ 1,000		$ 3,700
Swap [Member] \| Oil Derivative Swaps [Member] \| Third Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| bbl	314,500		314,500
Derivative, Swap Type, Fixed Price \| $ / Boe	60.41		60.41
Swap [Member] \| Oil Derivative Swaps [Member] \| Fourth Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| bbl	249,000		249,000
Derivative, Swap Type, Fixed Price \| $ / Boe	59.52		59.52
Swap [Member] \| Oil Derivative Swaps [Member] \| First Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| bbl	194,800		194,800
Derivative, Swap Type, Fixed Price \| $ / Boe	58.16		58.16
Swap [Member] \| Oil Derivative Swaps [Member] \| Second Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| bbl	191,350		191,350
Derivative, Swap Type, Fixed Price \| $ / Boe	58.32		58.32
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	189,200		189,200
Derivative, Swap Type, Fixed Price \| $ / Boe	58.43		58.43
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	118,000		118,000
Derivative, Swap Type, Fixed Price \| $ / Boe	55.65		55.65
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	56,175		56,175
Derivative, Swap Type, Fixed Price \| $ / Boe	55.23		55.23
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	52,325		52,325
Derivative, Swap Type, Fixed Price \| $ / Boe	57.00		57.00
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Third Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| MMBTU	12,680,000		12,680,000
Derivative, Swap Type, Fixed Price	2.81		2.81
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Fourth Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| MMBTU	11,486,000		11,486,000
Derivative, Swap Type, Fixed Price	2.89		2.89
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| First Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| MMBTU	6,280,000		6,280,000
Derivative, Swap Type, Fixed Price	2.87		2.87
Swap [Member] \| Natural Gas Derivative Swaps [Member] \| Second Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| MMBTU	3,688,000		3,688,000
Derivative, Swap Type, Fixed Price	2.76		2.76
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	3,585,000		3,585,000
Derivative, Swap Type, Fixed Price	2.76		2.76
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	3,362,000		3,362,000
Derivative, Swap Type, Fixed Price	2.77		2.77
Swap [Member] \| Natural Gas Liquid Derivative [Member] \| Third Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| bbl	180,000		180,000
Derivative, Swap Type, Fixed Price	27.93		27.93
Swap [Member] \| Natural Gas Liquid Derivative [Member] \| Fourth Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| bbl	180,000		180,000
Derivative, Swap Type, Fixed Price	27.93		27.93
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	4,354,800		4,354,800
Derivative, Average Floor Price	2.50		2.50
Derivative, Average Cap Price	3.52		3.52
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	3,791,000		3,791,000
Derivative, Average Floor Price	2.20		2.20
Derivative, Average Cap Price	2.75		2.75
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Third Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| MMBTU	14,625,000		14,625,000
Derivative, Swap Type, Fixed Price	0.04		0.04
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Fourth Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| MMBTU	14,625,000		14,625,000
Derivative, Swap Type, Fixed Price	(0.02)		(0.02)
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| First Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| MMBTU	11,739,000		11,739,000
Derivative, Swap Type, Fixed Price	(0.03)		(0.03)
Basis Swap [Member] \| Natural Gas Basis Derivative Swaps [Member] \| Second Quarter 2020 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| MMBTU	11,739,000		11,739,000
Derivative, Swap Type, Fixed Price	(0.04)		(0.04)
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	(0.03)		(0.03)
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	7,200,000		7,200,000
Derivative, Swap Type, Fixed Price	(0.003)		(0.003)
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	7,280,000		7,280,000
Derivative, Swap Type, Fixed Price	(0.003)		(0.003)
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	7,360,000		7,360,000
Derivative, Swap Type, Fixed Price	(0.003)		(0.003)
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	7,360,000		7,360,000
Derivative, Swap Type, Fixed Price	(0.003)		(0.003)
Basis Swap [Member] \| Oil Basis Derivative [Member] \| Third Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| bbl	75,000		75,000
Derivative, Swap Type, Fixed Price	3.73		3.73
Basis Swap [Member] \| Oil Basis Derivative [Member] \| Fourth Quarter 2019 [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Oil and Gas Production Hedged Volumes \| bbl	75,000		75,000
Derivative, Swap Type, Fixed Price	3.73		3.73