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Long-Term Debt (Schedule of Long-term Debt and Weighted Average Interest) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Total principal $ 56,971 $ 56,021
Deferred financing costs (258) (412)
Total long-term debt 56,713 55,609
Less current portion (5,697) (5,583)
Long-term portion 51,016 50,026
Credit Agreement - Bank of Montreal [Member]    
Debt Instrument [Line Items]    
Total principal $ 38,203 $ 40,495
Weighted-average interest rate 4.19% 4.04%
Credit Agreements - CPL [Member]    
Debt Instrument [Line Items]    
Total principal $ 0 $ 215
Weighted-average interest rate 0.00% 3.55%
Credit Agreements - SCCL [Member]    
Debt Instrument [Line Items]    
Total principal $ 2,704 $ 0
Weighted-average interest rate 4.94% 0.00%
Financing Obligation - CDR Land Lease [Member]    
Debt Instrument [Line Items]    
Total principal $ 15,541 $ 14,520
Weighted-average interest rate 13.44% 13.54%
Capital Lease - CDR [Member]    
Debt Instrument [Line Items]    
Total principal $ 523 $ 791
Weighted-average interest rate 6.89% 7.11%
Total Principal Debt [Member]    
Debt Instrument [Line Items]    
Weighted-average interest rate 6.67% 7.61%