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Long-Term Debt (Schedule of Long-term Debt and Weighted Average Interest) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Total principal $ 54,504 $ 56,971
Deferred financing costs (208) (258)
Total long-term debt 54,296 56,713
Less current portion (8,371) (5,697)
Long-term portion 45,925 51,016
Credit Agreement - Bank of Montreal [Member]    
Debt Instrument [Line Items]    
Total principal $ 33,972 $ 38,203
Weighted-average interest rate 4.41% 4.19%
Credit Facilities - CPL [Member]    
Debt Instrument [Line Items]    
Total principal $ 2,782  
Weighted-average interest rate 3.26%  
Credit Agreements - CCB [Member]    
Debt Instrument [Line Items]    
Total principal $ 2,636 $ 2,704
Weighted-average interest rate 2.21% 4.94%
Financing Obligation - CDR Land Lease [Member]    
Debt Instrument [Line Items]    
Total principal $ 14,806 $ 15,541
Weighted-average interest rate 14.12% 13.44%
Capital Lease - CDR [Member]    
Debt Instrument [Line Items]    
Total principal $ 308 $ 523
Weighted-average interest rate 6.80% 6.89%
Total Principal Debt [Member]    
Debt Instrument [Line Items]    
Weighted-average interest rate 6.94% 6.67%