Real Estate, Other Assets and Liabilities Held For Sale and Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Assets [Abstract]
Land	$ 0		$ 0		$ 16,681
Buildings and tenant improvements	0		0		322,811
Land held for development	2,230		2,230		1,089
Less - accumulated depreciation	0		0		(131,274)
Net real estate assets	2,230		2,230		209,307
Accrued straight-line rents receivable, net	0		0		11,730
Deferred leasing costs, net	0		0		6,690
Prepaid expenses and other assets, net	157		157		13,221
Real estate and other assets, net, held for sale	2,387		2,387		240,948
Liabilities [Abstract]
Accounts payable, accrued expenses and other liabilities	0		0		(6,717)
Financing obligation	0		0		(7,402)
Liabilities held for sale	0		0		$ (14,119)
Discontinued Operations [Abstract]
Rental and other revenues	0	$ 12,593	8,484	$ 24,667
Operating expenses:
Rental property and other expenses	0	4,908	3,334	9,907
Depreciation and amortization	0	3,312	0	6,753
General and administrative	0	227	1,388	421
Total operating expenses	0	8,447	4,722	17,081
Interest expense	0	155	85	336
Other income	0	679	420	1,335
Income from discontinued operations	0	4,670	4,097	8,585
Net gains on disposition of discontinued operations	0	0	414,496	0
Total income from discontinued operations	$ 0	$ 4,670	418,593	8,585
Net Cash Provided by/(Used in) Discontinued Operations [Abstract]
Cash flows from operating activities			2,040	14,629
Cash flows from investing activities			$ 417,097	$ (6,897)

For the disposal group, including a component of the entity (discontinued operation), represents a total which includes the following: (1) aggregate of the carrying amounts as of the balance sheet date of investments in building and building improvements; and (2) carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants.

No definition available.