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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

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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