Property And Equipment (Narrative) (Details) AUD in Thousands						3 Months Ended		9 Months Ended
	Jun. 19, 2017 AUD property	Jun. 19, 2017 USD ($) property	Apr. 01, 2015 NZD property	May 23, 2014 AUD	May 23, 2014 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 AUD	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 AUD	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)	[1]	Apr. 30, 2015 NZD	Apr. 30, 2015 USD ($)	Apr. 01, 2015 USD ($)	May 12, 2014 AUD a	May 12, 2014 USD ($) a
Property, Plant and Equipment [Line Items]
Depreciation expense for property and equipment | $						$ 4,000,000	$ 4,000,000		$ 11,800,000	$ 11,200,000
Sale price | AUD								AUD 65,000				AUD 65,000
Less: Property book value | $											$ 225,631,000			$ 211,886,000
Total transaction gain, net												AUD 12,453	$ 9,400,000
Burwood [Member]
Property, Plant and Equipment [Line Items]
Number of land parcels sold | property	1	1
Sale price																			AUD 65,000	$ 50,800,000
Area of property | a																			50.6	50.6
Proceeds from the sale property	AUD 21,800	$ 16,500,000		AUD 6,500	$ 5,900,000
Sale agreements, prepayment as a percentage of net sale price								90.00%			90.00%
Percentage of acquisition completed	90.00%	90.00%
Expected final settlement								AUD 36,700	$ 28,800,000
Lake Taupo [Member]
Property, Plant and Equipment [Line Items]
Number of land parcels sold | property			2
Sale price			NZD 3,400,000															$ 2,400,000
Lake Taupo Parcel One [Member]
Property, Plant and Equipment [Line Items]
Sale price																NZD 2,200,000	$ 1,600,000
Less: Property book value																1,800,000	1,300,000
Lake Taupo Parcel Two [Member]
Property, Plant and Equipment [Line Items]
Sale price																1,200,000	831,000
Less: Property book value																NZD 615,000	$ 426,000

[1] Certain 2016 balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).