Discontinued Operations and Assets Held for Sale (Table Illustration of Discontinued Operations in Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Discontinued Operations
Revenues	$ 126	$ 49	$ 355	$ 32,164
Operating Expenses	1	(13)	9	(12,399)
Depreciation and amortization, discontinued operations	0	0	0	(3,517)
Operating Income (Loss)	127	36	364	16,248
Interest Expense	0	0	0	(6,053)
Income before gain on sales	127	36	364	10,195
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	252	399,354	166	417,729
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	379	399,390	530	427,924
Discontinued Operation, Tax Effect of Discontinued Operation	0	(3,220)	0	(3,220)
Income from discontinued operations	$ 379	$ 396,170	530	424,704
Payments For Second Generation Tenant Improvements Leasing Costs And Building Improvements			$ 30,237	30,871
Discontinued Operations [Member]
Discontinued Operations
Payments For Second Generation Tenant Improvements Leasing Costs And Building Improvements				$ 7,400