Property And Equiment (Narrative) (Details) AUD in Thousands							3 Months Ended		6 Months Ended
	Jun. 19, 2017 AUD property	Jun. 19, 2017 USD ($) property	Apr. 11, 2016 USD ($) ft² item	Apr. 01, 2015 NZD property	May 23, 2014 AUD	May 23, 2014 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 AUD	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	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							$ 3,500,000	$ 3,500,000		$ 7,300,000	$ 7,100,000
Sale price | AUD									AUD 65,000
Less: Property book value												$ 219,534,000	$ 211,886,000
Total transaction gain, net									12,453			9,400,000
5995 Sepulveda Blvd, Culver City [Member]
Property, Plant and Equipment [Line Items]
Sale price			$ 11,200,000
Area of property | ft²			24,000
Number of parking spaces | item			72
Percent of leasable area			50.00%
Burwood [Member]
Property, Plant and Equipment [Line Items]
Number of land parcels sold | property	1	1
Sale price																		AUD 65,000	$ 50,600,000
Remaining purchase price									AUD 58,500			$ 44,900,000
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	$ 28,100,000
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).