Segment Information - Schedule of Reconciliation of NOI to Net Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Segment Reporting [Abstract]
Rental income	$ 167,972	$ 172,040
Tenant reimbursements and other income	45,083	45,220
Operating expenses	(97,871)	(101,731)
NOI	115,184us-gaap_GrossProfit	115,529us-gaap_GrossProfit
Depreciation and amortization	(62,699)	(51,649)
General and administrative	(16,558)us-gaap_GeneralAndAdministrativeExpense	(24,848)us-gaap_GeneralAndAdministrativeExpense
Loss (reversal of loss) on asset impairment	(1,904)us-gaap_AssetImpairmentCharges	4,761us-gaap_AssetImpairmentCharges
Acquisition related costs	0	(5)
Operating income	34,023us-gaap_OperatingIncomeLoss	43,788us-gaap_OperatingIncomeLoss
Interest and other income	3,448us-gaap_InterestAndOtherIncome	384us-gaap_InterestAndOtherIncome
Interest expense	(29,842)us-gaap_InterestExpense	(37,935)us-gaap_InterestExpense
Loss on early extinguishment of debt	(428)	0
Gain on issuance of shares by an equity investee	0	109
Gain on sale of properties	5,868us-gaap_GainLossOnSaleOfProperties	0us-gaap_GainLossOnSaleOfProperties
Income from continuing operations before income taxes and equity in earnings of investees	13,069	6,346
Income tax benefit (expense)	561us-gaap_IncomeTaxExpenseBenefit	(555)us-gaap_IncomeTaxExpenseBenefit
Equity in earnings of investees	0	10,934
Income from continuing operations	13,630	16,725
Income from discontinued operations	0	4,011
Loss on asset impairment from discontinued operations	0	(288)
Net income	$ 13,630us-gaap_NetIncomeLoss	$ 20,448us-gaap_NetIncomeLoss

In accordance with the provisions of their lease agreement, this element represents allowable charges due a landlord from its tenant. In retail store and office building leases, for example, tenant reimbursements may cover items such as taxes, utilities, and common area expenses. It also includes other real estate revenue.

No definition available.