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Long-Term Debt (Narrative - United Kingdom) (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2018
GBP (£)
Dec. 31, 2017
USD ($)
Line of Credit Facility      
Line of credit facility, amount outstanding $ 101,073,000   $ 128,470,000
Foreign Line of Credit | NatWest Bank      
Line of Credit Facility      
Line of credit facility, maximum borrowing capacity 2,103,000 £ 1,500,000  
Line of credit facility, amount outstanding 0    
Line of credit facility, current borrowing capacity 1,755,000    
Foreign Line of Credit | Natwest Bank Outstanding Guarantees      
Line of Credit Facility      
Line of credit facility, amount outstanding $ 348,000    
Foreign Line of Credit | Base Rate | NatWest Bank      
Line of Credit Facility      
Debt instrument, basis spread on variable rate 2.50%