Debt (Reconciliation Of Secured Contingent Obligation At Fair Value) (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended	21 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2020
Secured Debt [Abstract]
Secured contingent payment obligation	$ 26,651
Secured contingent payment obligation	28,788	$ 26,651	$ 28,788
Contingent Payment Obligation [Member] | Unsecured Debt [Member]
Secured Debt [Abstract]
Proceeds from contingent payment obligation			1,000
Change in fair value	1,350
Unsecured Debt [Abstract]
Unsecured contingent payment obligation
Reclassification of other liabilities	1,003
Proceeds from sale of contingent payment rights	984
Initial fair market value of modification	436
Change in fair value	1,350
Unsecured contingent payment obligation	3,773		3,773
Contingent Payment Obligation [Member] | Secured Debt [Member]
Secured Debt [Abstract]
Secured contingent payment obligation	26,651	25,557	25,557
Change in fair value	2,137	1,094
Secured contingent payment obligation	28,788	26,651	$ 28,788
Unsecured Debt [Abstract]
Change in fair value	$ 2,137	$ 1,094