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Financial Instruments (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]          
Unrealized loss on derivative, net of tax $ (4,094) $ (1,285)      
Amounts reclassified from accumulated other comprehensive loss, net of tax 344        
Interest expense 1,702 $ 1,609      
Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member]          
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]          
Amounts reclassified from accumulated other comprehensive loss, net of tax 344        
Interest Rate Swap [Member]          
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]          
Interest rate swap notional amount $ 142,500     $ 144,400 $ 155,300
Fixed interest rate 2.928%     2.928% 1.4935%
Fair value of interest rate swap $ 11,300     $ 6,300  
Unrealized loss on interest rate swap 5,000        
Unrealized loss on derivative, net of tax 3,700        
Gain On Contract Termination     $ 3,500    
Amounts reclassified from accumulated other comprehensive loss 500        
Amounts reclassified from accumulated other comprehensive loss, net of tax $ 300