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Other Liabilities (Summary Of Other Liabilities Including Pension) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2014
Aug. 29, 2014
Liability, Retirement and Postemployment Benefits [Abstract]        
Liability for demolition costs $ 2,425 $ 2,745    
Accrued pension 684 684    
Security deposit payable 108 114    
Finance lease liabilities 60 93    
Other 33 17    
Other current liabilities 3,310 3,653    
Lease make-good provision 6,243 6,667    
Accrued pension 4,366 4,469 $ 7,500 $ 7,500
Environmental reserve 1,656 1,656    
Lease liability 5,900 5,900    
Acquired leases 31 37    
Finance lease liabilities 102 116    
Other 6 9    
Other liabilities $ 18,304 $ 18,854