Fair Value Measurement of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	$ 464		$ 24,176
Interest rate swap liability	4,366		4,526
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	9,271	[1]	6,973	[1]
Tenant receivables, net	22,196	[1]	31,145	[1]
Restricted cash and escrows	751	[1]	394	[1]
Interest rate swaps	464		24,176
Accounts payable and accrued expenses	16,983	[1]	16,680	[1]
Debt	2,029,822		2,002,205
Interest Rate Swap [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability	4,366		4,526
Level 1 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	9,271	[1]	6,973	[1]
Tenant receivables, net	22,196	[1]	31,145	[1]
Restricted cash and escrows	751	[1]	394	[1]
Accounts payable and accrued expenses	16,983	[1]	16,680	[1]
Level 2 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	464		24,176
Debt	2,036,959		2,004,870
Level 2 [Member] | Interest Rate Swap [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability	$ 4,366		$ 4,526

[1] For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to their short-term maturity.