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Long-Term Debt and Related Matters (Narrative - United Kingdom) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
GBP (£)
Dec. 31, 2016
USD ($)
Line of Credit Facility      
Line of credit outstanding $ 128,470,000   $ 127,073,000
NatWest Bank [Member] | Foreign Line of Credit      
Line of Credit Facility      
Line of credit maximum borrowing capacity 2,027,000 £ 1,500,000  
Line of credit outstanding 0    
Remaining borrowing capacity $ 1,494,000   $ 1,650,000
NatWest Bank [Member] | Foreign Line of Credit | Base Rate      
Line of Credit Facility      
Variable rate on spread 2.50%    
NatWest Bank Outstanding Guarantees | Foreign Line of Credit      
Line of Credit Facility      
Line of credit outstanding $ 533,000