Subsequent Events (Details)	Sep. 30, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2012 Subsequent Event [Member] USD ($)	Sep. 30, 2012 Indooroopilly Property [Member] USD ($)	Sep. 30, 2012 Indooroopilly Property [Member] AUD	Oct. 05, 2012 Indooroopilly Property [Member] Subsequent Event [Member] USD ($)	Oct. 05, 2012 Indooroopilly Property [Member] Subsequent Event [Member] AUD	Sep. 30, 2012 Indooroopilly Property [Member] Subsequent Event [Member] USD ($)	Sep. 30, 2012 Indooroopilly Property [Member] Subsequent Event [Member] AUD	Oct. 31, 2012 Bank Of America [Member] USD ($)	Oct. 31, 2012 Bank Of America [Member] Minimum [Member] Subsequent Event [Member]	Oct. 31, 2012 Bank Of America [Member] Maximum [Member] Subsequent Event [Member]	Oct. 31, 2012 GE Term Loan [Member] Subsequent Event [Member] USD ($)	Oct. 31, 2012 Bank Of America Leasing And Capital [Member] Subsequent Event [Member] USD ($)	Sep. 30, 2012 Previous Line Of Credit Facility [Member] Subsequent Event [Member] USD ($)	Oct. 31, 2012 Credit Facility [Member] Subsequent Event [Member] USD ($)	Oct. 31, 2012 Line Of Credit Facility [Member] Subsequent Event [Member] USD ($)
Subsequent Event [Line Items]
Line of credit facility										$ 30,000,000				$ 15,500,000	$ 3,000,000	$ 30,000,000	$ 5,000,000
Assets held for sale	12,258,000	14,495,000		12,500,000	12,100,000			12,500,000	12,100,000
Impairment expense				283,000	272,000			283,000	272,000
Agreement price for property						12,400,000	12,000,000
Note payable	202,312,000	209,614,000											27,700,000
Spread on variable interest rate											2.50%	3.00%
Notional amount of derivative			$ 30,200,000