Property And Equiment (Narrative) (Details) AUD in Millions						3 Months Ended
		Apr. 11, 2016 USD ($) ft² item	Apr. 01, 2015 NZD property	May 23, 2014 AUD	May 23, 2014 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 AUD	Mar. 31, 2017 USD ($)	Dec. 31, 2016 AUD	Dec. 31, 2016 USD ($)		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
Carrying value of property									$ 216,358,000		$ 211,886,000	[1]
Gain (loss) on sale of assets	[1]						$ 393,000
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]
Sale price																AUD 65.0	$ 50,600,000
Remaining purchase price								AUD 58.5	44,700,000
Carrying value of property								AUD 52.1	$ 39,800,000	AUD 52.1	$ 37,700,000
Area of property | a																50.6	50.6
Proceeds from the sale property				AUD 6.5	$ 5,900,000
Sale agreements, prepayment as a percentage of net sale price								90.00%	90.00%
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
Carrying value of property													1,800,000	1,300,000
Lake Taupo Parcel Two [Member]
Property, Plant and Equipment [Line Items]
Sale price													1,200,000	831,000
Carrying value of property													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).