Discontinued Operations - Revenues and Expenses in Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]
Income from office and parking properties	$ 0	$ 1	$ 0	$ 206
Operating expenses	0	51	0	183
Depreciation and amortization	0	0	0	116
Total expenses	0	51	0	299
Loss from discontinued operations	0	(50)	0	(93)
Net gains on sale of real estate from discontinued operations	0	0	0	10,463
Total discontinued operations	0	(50)	0	10,370
Net (income) loss attributable to noncontrolling interest from discontinued operations - unit holders	0	3	0	(516)
Total discontinued operations - Company's share	$ 0	$ (47)	$ 0	$ 9,854