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Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred tax assets: [Abstract] |  |
Net operating loss carryforwards - Federal | $ 11,670 | $ 27,935
Net operating loss carryforwards - State | 10,875 | 8,788
Tax credit carryforwards - Federal | 64,081 | 49,937
Tax credit carryforwards - State | 7,369 | 7,750
Derivative financial instruments |  | 342
Deferred revenue | 149 | 795
Interest expense carryforward | 6,609 | 5,539
Investment in partnerships | 45,519 | 46,774
Inventory valuation | 290 | 1,560
Stock-based compensation | 1,439 | 1,347
Accrued expenses | 5,351 | 4,325
Leases | 7,958 | 6,993
Organizational and start-up costs | 1,047 |
Other | 337 | 51
Total | 162,694 | 162,136
Valuation allowance | (43,336) | (33,337)
Total deferred tax assets | 119,358 | 128,799
Deferred tax liabilities: |  |
Convertible debt | (9,154) | (12,266)
Fixed assets | (104,364) | (107,909)
Derivative financial instruments | (724) |
Organizational and start-up costs |  | (4,484)
Right-of-use assets | (5,116) | (4,140)
Total deferred tax liabilities | (119,358) | (128,799)
Deferred income taxes |  |

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