Discontinued Operations and Assets Held for Sale (Table Illustration of Discontinued Operations in Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Discontinued Operations
Revenues	$ 380	$ 7	$ 735	$ 32,171
Operating Expenses	(3)	(50)	6	(12,449)
Depreciation and amortization, discontinued operations	0	0	0	(3,517)
Operating Income (Loss)	377	(43)	741	16,205
Interest Expense	0	0	0	(5,659)
Income (loss) before gain on sales	377	(43)	741	10,546
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	319	66	485	417,795
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	696	23	1,226	428,341
Discontinued Operation, Tax Effect of Discontinued Operation	0	45	0	(3,175)
Income from discontinued operations	$ 696	$ 68	1,226	425,166
Payments For Second Generation Tenant Improvements Leasing Costs And Building Improvements			$ 39,169	45,688
Discontinued Operations [Member]
Discontinued Operations
Payments For Second Generation Tenant Improvements Leasing Costs And Building Improvements				$ 7,400