Real Estate Transactions (Narrative) (Details)								12 Months Ended
	Jun. 13, 2018 AUD ($) m²	Dec. 14, 2017 AUD ($)	Dec. 14, 2017 USD ($)	Jun. 19, 2017 AUD ($)	Jun. 19, 2017 USD ($)	May 23, 2014 AUD ($)	May 23, 2014 USD ($)	Dec. 31, 2018 AUD ($)	Dec. 31, 2018 USD ($)	Jun. 29, 2018 m²	Jun. 29, 2018 ft²	Jun. 29, 2018 m	Jun. 29, 2018 ft	Jun. 29, 2018 AUD ($)	Jun. 29, 2018 USD ($)	Jun. 13, 2018 ft²	May 12, 2014 AUD ($) a	May 12, 2014 USD ($) a
Burwood [Member]
Property, Plant and Equipment [Line Items]
Sale price								$ 64,925,000									$ 65,000,000	$ 50,600,000
Adjustment to sale price								$ 75,000	$ 56,000
Area of property | a																	50.6	50.6
Proceeds from the sale property		$ 36,600,000	$ 28,100,000	$ 21,800,000	$ 16,600,000	$ 6,500,000	$ 5,900,000
Property In Auburn, Australia [Member]
Property, Plant and Equipment [Line Items]
Sale price														$ 4,500,000	$ 3,500,000
Land At Cannon Park, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property	15,150															163,000
Payment to acquire property | $	$ 1
Building [Member] | Property In Auburn, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property											16,830
Land [Member] | Property In Auburn, Australia [Member]
Property, Plant and Equipment [Line Items]
Area of property											20,870
Land [Member] | Property In Auburn, Australia [Member] | Redyard ETC [Member]
Property, Plant and Equipment [Line Items]
Area of property										48,309	519,992
Length of frontage												498	1,620
Rentable Area											147,000