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Long-Term Debt (Narrative - United Kingdom) (Details)
6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Line of Credit Facility      
Line of credit facility, amount outstanding $ 97,867,000   $ 128,470,000
Foreign Line of Credit | Natwest Bank      
Line of Credit Facility      
Line of credit facility, maximum borrowing capacity 1,981,000 £ 1,500,000  
Line of credit facility, amount outstanding 0    
Line of credit facility, current borrowing capacity $ 1,577,000    
Foreign Line of Credit | Natwest Bank | Base Rate      
Line of Credit Facility      
Debt instrument, basis spread on variable rate 2.50%    
Foreign Line of Credit | Natwest Bank Outstanding Guarantees      
Line of Credit Facility      
Line of credit facility, amount outstanding $ 404,000