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Properties And Equipment (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 29, 2018
ft²
Jun. 13, 2018
ft²
May 12, 2014
a
Property, Plant and Equipment [Line Items]            
Depreciation expense for operating property | $ $ 22.0 $ 19.5 $ 14.0      
Capitalized interest | $ $ 6.2 $ 3.3        
Land At Cannon Park, Townsville, Australia [Member]            
Property, Plant and Equipment [Line Items]            
Area of property         163,000  
Building [Member] | Property In Auburn Redyard, Australia [Member]            
Property, Plant and Equipment [Line Items]            
Area of property       16,830    
Land [Member] | Property In Auburn Redyard, Australia [Member]            
Property, Plant and Equipment [Line Items]            
Area of property       20,870    
Burwood [Member]            
Property, Plant and Equipment [Line Items]            
Area of property | a           50.6
Redyard ETC [Member] | Land [Member] | Property In Auburn Redyard, Australia [Member]            
Property, Plant and Equipment [Line Items]            
Area of property       519,358