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Property And Equipment (Narrative) (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 13, 2018 AUD ($) m² | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 29, 2018 m² | Jun. 29, 2018 ft² | Jun. 29, 2018 AUD ($) | Jun. 29, 2018 m | Jun. 29, 2018 ft | Jun. 29, 2018 USD ($) | Jun. 13, 2018 ft²
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense for operating property | $ |  | $ 5.4 | $ 5.4 | $ 10.8 | $ 10.2 |  |  |  |  |  |  |
Land At Cannon Park, Townsville, Australia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area of property | 15,150 |  |  |  |  |  |  |  |  |  |  | 163,000
Payment to acquire property | $ | $ 1 |  |  |  |  |  |  |  |  |  |  |
Property In Auburn/Redyard, Australia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Sale price |  |  |  |  |  |  |  | $ 4,500,000 |  |  | $ 3.5 |
Building [Member] | Property In Auburn/Redyard, Australia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area of property | ft² |  |  |  |  |  |  | 16,830 |  |  |  |  |
Land [Member] | Property In Auburn/Redyard, Australia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area of property | ft² |  |  |  |  |  |  | 20,870 |  |  |  |  |
Redyard ETC [Member] | Land [Member] | Property In Auburn/Redyard, Australia [Member] |  |  |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Area of property |  |  |  |  |  | 48,309 | 519,992 |  |  |  |  |
Length of frontage |  |  |  |  |  |  |  |  | 498 | 1,620 |  |

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