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Income tax Effective Income Tax Rate Reconcilitation (Details) | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Income Tax Disclosure [Abstract] |  |
Federal statutory tax rate | 21.00% | 21.00%
Federal tax credits | (8.90%) | (10.90%)
State and local taxes, net of federal tax benefit | 8.80% | 7.40%
Flow through depreciation and cost basis differences | 0.30% | 1.60%
Excess deferred tax amortization | (3.20%) | (1.90%)
Other | (8.20%) | 0.00%
Effective tax rate | 8.60% | 18.20%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent | (1.20%) | 1.00%

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to depletion. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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