Asset Retirement Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Decommissioning and Other Asset Retirement Obligations Detail [Table]
Beginning balance for the period, as reported	$ 11,738	$ 9,912
Activity in the period:
Accretion of liability	563	624
Retirement obligations incurred	59	265
Revisions in estimated cash flows		1,349
Settlement of retirement obligations	(35)	(412)	$ 0
Ending balance at December 31	12,202	11,738	9,912
Change in estimated cash flows to decommission oil and gas properties	(123)
Direct charges to operating expense for increased estimated cash flows	$ 0	$ 0	$ 2,629

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Direct charges to operating expense for increased estimated cash flows.

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The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
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Amount of asset retirement obligations incurred during the period.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations.

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