Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 Lawsuit		Dec. 31, 2012	Dec. 31, 2011	Aug. 12, 2013 property
Significant Accounting Policies [Line Items]
Number of real estate properties					3
Interest capitalized	$ 31,000		$ 0	$ 0
Intangible Lease Liabilities (Below-Market In-Place Leases)	91,369,000			81,736,000
Amortization expense related to Intangible Lease Origination Costs and Absorption Period Costs	30,409,000		36,151,000	48,013,000
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	5,278,000		5,678,000	7,065,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Total	74,377,000		54,745,000
2014	6,825,000
2015	6,328,000
2016	6,205,000
2017	6,300,000
2018	5,702,000
Thereafter	15,753,000
Total	47,113,000
Weighted-Average Amortization Period (in years)	8 years
Provision for doubtful accounts	200,000		0
Recoveries of bad debts				(400,000)
Amortization of deferred financing costs and fair market value adjustments on notes payable	2,600,000		2,600,000	3,200,000
Capitalized internal leasing costs	100,000		0	0
Amortization of deferred lease costs	34,000,000		29,800,000	30,000,000
Amortization of lease incentive	3,500,000		2,500,000	3,700,000
Amortization of debt discount (premium)	0		0	1,400,000
Shares-in-trust, shares authorized	150,000,000		150,000,000
Preferred stock, shares authorized	100,000,000		100,000,000
Common stock, shares authorized	750,000,000		750,000,000
Common stock, par value	$ 0.01		$ 0.01
Stock repurchase program, authorized amount	150,000,000
Stock repurchase program, remaining authorized repurchase amount	89,800,000
Dividend reinvestment plan, shareholders discount	2.00%
Number of lawsuits as defendant	2
Litigation settlement charge	(1,250,000)		7,500,000	0
Insurance recoveries	1,300,000
Business interruption insurance recoveries	1,500,000		0	0
Provision for income taxes	0		9,000	5,000
Minimum [Member]
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Real estate investment trust status required taxable income distribution rate	90.00%
Building [Member]
Significant Accounting Policies [Line Items]
Useful life	40 years
Building Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life	5 years
Building Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life	25 years
Land Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life	20 years
Land Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life	25 years
Furniture, fixtures, and equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life	3 years
Furniture, fixtures, and equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life	5 years
Consolidated Joint Venture [Member]
Significant Accounting Policies [Line Items]
Number of real estate properties	3
Above-Market In-Place Lease Assets [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets:	21,137,000			21,468,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2014	2,050,000
2015	1,891,000
2016	1,662,000
2017	886,000
2018	309,000
Thereafter	131,000
Total	6,929,000
Weighted-Average Amortization Period (in years)	4 years
Absorption Period Costs [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets:	125,060,000			101,217,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2014	15,046,000
2015	13,789,000
2016	10,996,000
2017	8,241,000
2018	5,687,000
Thereafter	13,689,000
Total	67,448,000
Weighted-Average Amortization Period (in years)	6 years
Lease Origination Costs [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets:	158,427,000			116,995,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2014	18,882,000	[1]
2015	17,490,000	[1]
2016	14,652,000	[1]
2017	11,671,000	[1]
2018	8,726,000	[1]
Thereafter	21,449,000	[1]
Total	$ 92,870,000	[1]
Weighted-Average Amortization Period (in years)	6 years	[1]

[1] Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.