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Property And Equipment (Narrative) (Details) $ in Millions |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 14, 2017 AUD ($) | Dec. 14, 2017 USD ($) | Jun. 19, 2017 AUD ($) | Jun. 19, 2017 USD ($) | May 23, 2014 AUD ($) | May 23, 2014 USD ($) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2017 AUD ($) | Dec. 31, 2017 USD ($)
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Depreciation expense for operating property |  |  |  |  |  |  | $ 4,700,000 | $ 3,500,000 |  |
Capitalized interest charges |  |  |  |  |  |  | $ 335,000 |  |  |
Disposal Group, Not Discontinued Operations [Member] | Burwood [Member] |  |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from the sale property | $ 36.6 | $ 28,100,000 | $ 21.8 | $ 16,600,000 | $ 6.5 | $ 5,900,000 |  |  |  |
Sale price |  |  |  |  |  |  |  |  | $ 64.9 | $ 50,600,000

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