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Long-Term Debt (Schedule Of Long-Term Debt And Weighted Average Interest) (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total principal $ 190,531 $ 193,811
Deferred financing costs (8,086) (9,261)
Total long-term debt 182,445 184,550
Less current portion (4,259) (10,718)
Long-term portion 178,186 173,832
Credit Agreement - Macquarie [Member]    
Debt Instrument [Line Items]    
Total principal $ 167,025 $ 168,300
Weighted-average interest rate 6.69% 6.72%
Credit Agreements - CPL [Member]    
Debt Instrument [Line Items]    
Total principal $ 546 $ 1,296
Weighted-average interest rate 2.03% 2.61%
UniCredit Term Loans [Member]    
Debt Instrument [Line Items]    
Total principal $ 7,658 $ 1,502
Weighted-average interest rate 2.21% 2.05%
UniCredit Agreement [Member]    
Debt Instrument [Line Items]    
Total principal   $ 7,400
Weighted-average interest rate   2.60%
Financing Obligation - CDR Land Lease [Member]    
Debt Instrument [Line Items]    
Total principal $ 15,302 $ 15,313
Weighted-average interest rate 13.58% 13.70%
Total Principal [Member]    
Debt Instrument [Line Items]    
Weighted-average interest rate 7.04% 7.03%