Stock-Based Compensation (Schedule of Restricted Stock Awards and Stock Options) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]
Recognized stock compensation expense	$ 1,600	$ 4,700	$ 4,100	$ 8,500
Capitalized stock compensation cost for our oil and natural gas properties	0	700	0	1,300
Tax benefit on stock based compensation	$ 400	$ 1,200	$ 1,000	$ 2,100

Share-based Compensation Arrangement by Share-based Payment Award [Abstract]

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Name Accounting Standards Codification
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Amount of cost capitalized for award under share-based payment arrangement.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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