Property And Equipment (Narrative) (Details) AUD in Millions										3 Months Ended		9 Months Ended
	Apr. 11, 2016 USD ($) ft² item	Dec. 23, 2015 AUD ft² item	Dec. 23, 2015 USD ($) ft² item	Apr. 16, 2015 AUD	Apr. 16, 2015 USD ($)	Apr. 01, 2015 NZD property	Feb. 25, 2015 USD ($)	May 23, 2014 AUD	May 23, 2014 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 AUD	Sep. 30, 2016 USD ($)	Dec. 31, 2015 AUD	Dec. 31, 2015 USD ($)		Apr. 30, 2015 NZD	Apr. 30, 2015 USD ($)	Apr. 16, 2015 USD ($)	Apr. 01, 2015 USD ($)	May 12, 2014 AUD a	May 12, 2014 USD ($) a
Depreciation expense for property and equipment										$ 4,000,000	$ 3,300,000	$ 11,200,000	$ 10,100,000
Carrying value of property															$ 227,919,000		$ 210,298,000	[1]
Gain (loss) on sale of assets												$ 393,000	$ 11,023,000
Goodwill															20,434,000		19,715,000	[1]
5995 Sepulveda Blvd, Culver City [Member]
Sale price	$ 11,200,000
Area of property | ft²	24,000
Number of parking spaces | item	72
Percent of leasable area	50.00%
Reduction in headquarters occupancy cost	$ 350,000
Burwood [Member]
Sale price																							AUD 65.0	$ 50,800,000
Remaining purchase price														AUD 58.5	44,900,000
Carrying value of property														AUD 52.1	$ 40,000,000	AUD 52.1	$ 38,000,000
Area of property | a																							50.6	50.6
Proceeds from the sale property								AUD 6.5	$ 5,900,000
Doheny Condo, Los Angeles [Member]
Sale price							$ 3,000,000
Gain (loss) on sale of assets							$ 2,800,000
Lake Taupo [Member]
Number of land parcels sold | property						2
Sale price						NZD 3,400,000																$ 2,400,000
Lake Taupo Parcel One [Member]
Sale price																			NZD 2,200,000	$ 1,600,000
Carrying value of property																			1,800,000	1,300,000
Lake Taupo Parcel Two [Member]
Sale price																			1,200,000	831,000
Carrying value of property																			NZD 615,000	$ 426,000
Moonee Ponds [Member]
Sale price				AUD 23.0																	$ 17,500,000
Gain (loss) on sale of assets				AUD 10.3	$ 8,000,000
Cannon Park, Queensland [Member]
Area of property | ft²		133,000	133,000
Percentage of acquisition completed		100.00%	100.00%
Payment to acquire property		AUD 33.4	$ 24,100,000
Interest														75.00%	75.00%
Number of major tenants | item		3	3
Number of specialty family oriented restaurant tenants | item		10	10
Number of retailers | item		4	4
Percentage of property leased												98.00%
Goodwill															$ 0
Number of land parcels acquired | item		2	2
Cannon Park, Queensland [Member] | Minimum [Member]
Lease term												9 months
Cannon Park, Queensland [Member] | Maximum [Member]
Lease term												8 years

[1] Certain prior period amounts have been reclassified to conform to the current period presentation (see Note 1 - The Company and Basis of Presentation - Reclassifications)