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Long-Term Debt (Schedule of Long-term Debt and Weighted Average Interest) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total principal $ 53,535 $ 56,971
Deferred financing costs (250) (258)
Total long-term debt 53,285 56,713
Less current portion (20,079) (5,697)
Long-term portion 33,206 51,016
Credit Agreement - Bank of Montreal [Member]    
Debt Instrument [Line Items]    
Total principal $ 33,323 $ 38,203
Weighted-average interest rate 4.43% 4.19%
Credit Facility- CPL [Member]    
Debt Instrument [Line Items]    
Total principal $ 2,291  
Weighted-average interest rate 2.42%  
Credit Agreement - CCB [Member]    
Debt Instrument [Line Items]    
Total principal $ 2,607 $ 2,704
Weighted-average interest rate 2.32% 4.94%
Financing Obligation - CDR Land Lease [Member]    
Debt Instrument [Line Items]    
Total principal $ 15,061 $ 15,541
Weighted-average interest rate 13.63% 13.44%
Capital Leases [Member]    
Debt Instrument [Line Items]    
Total principal $ 253 $ 523
Weighted-average interest rate 6.95% 6.89%
Total Principal Debt [Member]    
Debt Instrument [Line Items]    
Weighted-average interest rate 6.78% 6.67%