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Long-Term Debt and Related Matters - Narrative - United Kingdom (Details)
Dec. 31, 2019
USD ($)
Apr. 29, 2019
USD ($)
Apr. 29, 2019
GBP (£)
Dec. 31, 2018
USD ($)
Line of Credit Facility        
Line of credit facility, amount outstanding $ 33,868,000     $ 74,008,000
Foreign Line of Credit | Natwest Bank        
Line of Credit Facility        
Line of credit facility, maximum borrowing capacity     £ 1,500,000 1,924,000
Line of credit facility, amount outstanding   $ 0    
Line of credit facility, current borrowing capacity       $ 1,606,000
Foreign Line of Credit | Natwest Bank Outstanding Guarantees        
Line of Credit Facility        
Line of credit facility, amount outstanding   $ 318,000