Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets: [Abstract]
Net operating loss carryforwards - Federal	$ 14,857	$ 11,670
Net operating loss carryforwards - State	12,147	10,875
Tax credit carryforwards - Federal	64,081	64,081
Tax credit carryforwards - State	7,281	7,369
Derivative financial instruments	4,728
Deferred revenue	129	149
Interest expense carryforward	12,063	6,609
Investment in partnerships	43,244	45,519
Inventory valuation	1,259	290
Stock-based compensation	1,312	1,439
Accrued expenses	4,511	5,351
Leases	8,885	7,958
Organizational and start-up costs	746	1,047
Other	783	337
Total	176,026	162,694
Valuation allowance	(69,834)	(43,336)
Total deferred tax assets	106,192	119,358
Deferred tax liabilities:
Convertible debt		(9,154)
Fixed assets	(100,166)	(104,364)
Derivative financial instruments		(724)
Organizational and start-up costs	(6,026)	(5,116)
Right-of-use assets	(106,192)	(119,358)
Total deferred tax liabilities