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Long-Term Debt (Narrative - United Kingdom) (Details)
9 Months Ended
Sep. 30, 2018
GBP (£)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Line of Credit Facility      
Line of credit facility, amount outstanding   $ 75,401,000 $ 128,470,000
Foreign Line of Credit | Natwest Bank      
Line of Credit Facility      
Line of credit facility, maximum borrowing capacity £ 1,500,000 1,955,000  
Line of credit facility, amount outstanding   0  
Line of credit facility, current borrowing capacity   1,636,000  
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   $ 319,000