Discontinued Operations - Revenues and Expenses in Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenues
Income from office and parking properties	$ 0	$ 52	$ 0	$ 99
Expenses
Operating expenses	0	341	0	364
Depreciation and amortization	0	0	0	116
Total expenses	0	341	0	480
Loss from discontinued operations	0	(289)	0	(381)
Net gains on sale of real estate from discontinued operations	0	0	0	10,463
Total discontinued operations	0	(289)	0	10,082
Net (income) loss attributable to noncontrolling interest from discontinued operations - unit holders	0	111	0	(406)
Total discontinued operations - Company's share	$ 0	$ (178)	$ 0	$ 9,676