Subsequent Events (Narrative) (Details) $ / shares in Units, ft² in Millions, NZD in Millions, AUD in Millions	1 Months Ended		9 Months Ended				12 Months Ended
	Oct. 31, 2016 NZD	Oct. 31, 2016 USD ($)	Sep. 30, 2016 NZD		Sep. 30, 2016 USD ($)		Dec. 31, 2015 USD ($)		Dec. 31, 2016 AUD	Dec. 31, 2016 USD ($)	Nov. 07, 2016 $ / shares	Oct. 21, 2016 ft²	May 12, 2014 AUD a	May 12, 2014 USD ($) a
Subsequent Event [Line Items]
Contractual facility					$ 210,849,000		$ 207,075,000
Burwood [Member]
Subsequent Event [Line Items]
Sale price													AUD 65.0	$ 50,800,000
Area of property | a													50.6	50.6
Subsequent Event [Member]
Subsequent Event [Line Items]
Share price | $ / shares											$ 17.00
Subsequent Event [Member] | Olino [Member]
Subsequent Event [Line Items]
Area of property | ft²												1.4
US Bank Of America Line Of Credit [Member]
Subsequent Event [Line Items]
Contractual facility					$ 5,000,000		$ 5,000,000
Maturity date			Oct. 31, 2017		Oct. 31, 2017		Oct. 31, 2017
US Bank Of America Line Of Credit [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Contractual facility		$ 5,000,000
Extension period	2 years	2 years
Maturity date	Oct. 31, 2019	Oct. 31, 2019
Westpac Corporate Credit Facility [Member]
Subsequent Event [Line Items]
Contractual facility			NZD 50.0		$ 36,450,000	[1]	$ 34,210,000	[2]
Maturity date			Mar. 31, 2018	[1]	Mar. 31, 2018	[1]	Mar. 31, 2018	[2]
Westpac Corporate Credit Facility [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Contractual facility	NZD 53.0	$ 38,600,000
Increased amount of credit line	3.0	2,200,000
Westpac Corporate Credit Facility, Tranch 2 [Member]
Subsequent Event [Line Items]
Contractual facility			NZD 15.0		$ 10,900,000
Westpac Corporate Credit Facility, Tranch 2 [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Contractual facility	NZD 18.0	13,100,000
Amounts drawn		$ 0
Scenario, Forecast [Member] | Burwood [Member]
Subsequent Event [Line Items]
Prepayment amount									AUD 21.8	$ 16,700,000

[1] The contractual facilities and outstanding balances of the FC-denominated borrowings were translated into U.S. dollars based on the applicable exchange rates as of September 30, 2016.

[2] The contractual facilities and outstanding balances of the FC-denominated borrowings were translated into U.S. dollar based on the applicable exchange rates as of December 31, 2015.