Notes Payable (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Principal payments due in:
Total	$ 1,124,475,000us-gaap_LongTermDebt	$ 1,194,085,000us-gaap_LongTermDebt
Number of Real Estate Properties	34us-gaap_NumberOfRealEstateProperties
Notes payable
Long-term debt
Debt bearing interest at variable rates	50,800,000
Stated annual interest rate, low end of range (as a percent)	2.28%
Stated annual interest rate, high end of range (as a percent)	6.22%
Effective weighted average interest rate (as a percent)	5.03%
Principal payments due in:
April - December 2015	121,317,000
2016	560,609,000
2017	130,021,000
2018	97,622,000
2019	126,723,000
Thereafter	88,396,000
Unamortized discount	(213,000)
Total	1,124,475,000
Mezzanine Loan
Long-term debt
Debt Instrument, Interest Rate, Stated Percentage (as a percent)	9.80%
Assets Held-for-sale [Member]
Principal payments due in:
Total	$ 96,824,000	$ 97,257,000

Contractual interest rate for funds borrowed, under the debt agreement.

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