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Income Taxes (Schedule Of Differences Between The Income Tax Expense (Benefit)Computed At The Statutory Federal income Tax Rate And As Presented On The Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2020 | [1] | Sep. 30, 2020 | [1] | Jun. 30, 2020 | [1],[2] | Mar. 31, 2020 | [1] | Dec. 31, 2019 | [3] | Sep. 30, 2019 | [3] | Jun. 30, 2019 | [3] | Mar. 31, 2019 | [3] | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax expense at federal statutory rate |  |  |  |  |  |  |  |  | $ (33,698) | $ (36,317) | $ 1,060
State income tax expense, net of federal benefit |  |  |  |  |  |  |  |  | (802) | (7,839) | 702
Nondeductible compensation |  |  |  |  |  |  |  |  | 421 | 762 | 921
Noncontrolling interests |  |  |  |  |  |  |  |  | (4,015) | (3,961) | (4,370)
Unrecognized tax benefits |  |  |  |  |  |  |  |  | (28) | 36 | 15,148
R&D Credits |  |  |  |  |  |  |  |  |  | (323) | (34,979)
Increase in valuation allowance |  |  |  |  |  |  |  |  | 6,279 | 25,314 |
Disposition of subsidiary |  |  |  |  |  |  |  |  |  | (373) | (1,022)
Tax Cuts and Jobs Act impact |  |  |  |  |  |  |  |  |  |  | 278
Stock compensation |  |  |  |  |  |  |  |  | 721 | 369 | 993
Audit adjustments |  |  |  |  |  |  |  |  |  |  | 559
Amended return adjustments |  |  |  |  |  |  |  |  | (19,786) |  | 374
Other |  |  |  |  |  |  |  |  | 525 | 1,016 | 189
Income tax benefit | $ (1,922) | $ 7,280 | $ (11,458) | $ (44,283) | $ 19,514 | $ (12,565) | $ (15,322) | $ (12,943) | $ (50,383) | $ (21,316) | $ (20,147)
[1] | The fourth quarter of 2020 includes the recognition of a $8.5 million valuation allowance which impacted income tax expense.
[2] | During the third quarter of 2020, the company identified an immaterial issue which resulted in the overstatement of both revenues and cost of goods sold within the agribusiness and energy services segment as previously reported for the three and six months ended June 30, 2020. The second quarter revenues and cost of goods sold reflected in the quarterly financial data have been revised to correct these amounts.
[3] | The fourth quarter of 2019 includes the recognition of a $25.9 million valuation allowance which impacted income tax expense.

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