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Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2019
Asset Retirement Obligations [Abstract] |  |  |
Estimate of increase costs |  | $ 600 |
Additions | $ 359 |  | $ 595

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- Definition Asset Retirement Obligation, Estimate Of Increase Costs + References No definition available. + Details
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- References No definition available. + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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