Acquisitions, Disposals, And Assets Held For Sale (Summary Of Discontinued Operations) (Details)	3 Months Ended								12 Months Ended
	Dec. 31, 2012 USD ($)	Sep. 30, 2012 USD ($)	Jun. 30, 2012 USD ($)	Mar. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 30, 2011 USD ($)	Jun. 30, 2011 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2012 Indooroopilly Property [Member] USD ($)	Dec. 31, 2011 Indooroopilly Property [Member] USD ($)	Dec. 31, 2010 Indooroopilly Property [Member] USD ($)	Dec. 31, 2012 Indooroopilly Property [Member] AUD
Acquisitions, Disposals, And Assets Held For Sale [Line Items]
Revenue	$ 65,117,000	$ 63,934,000	$ 62,948,000	$ 62,431,000	$ 57,421,000	$ 66,554,000	$ 66,960,000	$ 54,044,000	$ 254,430,000	$ 244,979,000	$ 229,322,000	$ 793,000	$ 825,000	$ 809,000
Less: operating expense									235,303,000	226,801,000	216,253,000	560,000	593,000	712,000
Less: impairment expense												318,000			306,000
Income (loss) from discontinued operations, net of tax									$ (85,000)	$ 232,000	$ 97,000	$ (85,000)	$ 232,000	$ 97,000