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Borrowings (Narrative) (Details)
3 Months Ended
Feb. 27, 2019
USD ($)
credit_increase
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Line of Credit Facility [Line Items]      
Limit on annual cash dividends paid   $ 30,000,000  
Current portion of long term debt   $ 2,506,000 $ 2,506,000
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate   16.00%  
Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Credit agreement term 5 years    
Credit agreement, maximum borrowing capacity $ 100,000,000    
Number of credit increases | credit_increase 4    
Debt Instrument, Interest Rate, Effective Percentage   3.00%  
Term Loan Facility      
Line of Credit Facility [Line Items]      
Credit agreement term 5 years    
Credit agreement, maximum borrowing capacity $ 100,000,000    
Outstanding borrowings   $ 47,605,000