Long-Term Debt (Schedule Of Long-Term Debt And Weighted Average Interest) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total principal	$ 193,290	$ 193,811
Deferred financing costs	(8,869)	(9,261)
Total long-term debt	184,421	184,550
Less current portion	(10,619)	(10,718)
Long-term portion	173,802	173,832
Credit Agreement - Macquarie [Member]
Debt Instrument [Line Items]
Total principal	$ 167,875	$ 168,300
Weighted-average interest rate	6.64%	6.72%
Credit Agreements - CPL [Member]
Debt Instrument [Line Items]
Total principal	$ 994	$ 1,296
Weighted-average interest rate	2.02%	2.61%
UniCredit Loan [Member]
Debt Instrument [Line Items]
Total principal	$ 1,517	$ 1,502
Weighted-average interest rate	1.66%	2.05%
UniCredit Agreement [Member]
Debt Instrument [Line Items]
Total principal	$ 7,400	$ 7,400
Weighted-average interest rate	2.48%	2.60%
Financing Obligation - CDR Land Lease [Member]
Debt Instrument [Line Items]
Total principal	$ 15,504	$ 15,313
Weighted-average interest rate	11.62%	13.70%
Total Principal [Member]
Debt Instrument [Line Items]
Weighted-average interest rate	6.55%	7.03%

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount, after accumulated amortization, of debt discount (premium).

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Weighted average interest rate of debt outstanding.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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