Leases (Narrative) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)	Dec. 31, 2016 NZD ($)	Dec. 31, 2016 USD ($)		Dec. 31, 2015 USD ($)	[1]
Operating Leased Assets [Line Items]
Real estate revenue	$ 16,270,000		$ 13,551,000	[1]	$ 15,042,000
Accrued debt		$ 500,000	348,000
Total debt of unconsolidated joint ventures and entities		1,500,000	$ 1,000,000
Share of unconsolidated debt, based on ownership percentage		$ 500,000
Minimum [Member]
Operating Leased Assets [Line Items]
Lease term	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Lease term	35 years

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