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REVOLVING CREDIT FACILITY AND UNSECURED TERM LOANS (Details) (USD $)					3 Months Ended	12 Months Ended		3 Months Ended							0 Months Ended	1 Months Ended				0 Months Ended	1 Months Ended				3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Unsecured revolving credit facility	Mar. 31, 2013 Unsecured term loan maturing in March 2017 Interest rate swap agreement	Mar. 31, 2013 Term Loan Facility	Dec. 31, 2011 Term Loan Facility Rate	Jun. 20, 2011 Term Loan Facility	Mar. 31, 2013 Term Loan Facility Interest rate swap agreement	Mar. 31, 2013 Term Loan Facility Minimum	Mar. 31, 2013 Term Loan Facility Maximum	Mar. 31, 2013 Term Loan Facility Unsecured term loan	Dec. 31, 2011 Term Loan Facility Unsecured term loan	Mar. 31, 2013 Term Loan Facility Term Loan	Dec. 31, 2011 Term Loan Facility Term Loan	Jun. 20, 2011 Term Loan Facility Term Loan, 5-year maturity	Jun. 30, 2011 Term Loan Facility Term Loan, 5-year maturity	Mar. 31, 2013 Term Loan Facility Term Loan, 5-year maturity Interest rate swap agreement	Mar. 31, 2013 Term Loan Facility Term Loan, 5-year maturity Minimum	Mar. 31, 2013 Term Loan Facility Term Loan, 5-year maturity Maximum	Jun. 20, 2011 Term Loan Facility Term Loan, 7-year maturity	Jun. 30, 2011 Term Loan Facility Term Loan, 7-year maturity	Mar. 31, 2013 Term Loan Facility Term Loan, 7-year maturity Interest rate swap agreement	Mar. 31, 2013 Term Loan Facility Term Loan, 7-year maturity Minimum	Mar. 31, 2013 Term Loan Facility Term Loan, 7-year maturity Maximum	Mar. 31, 2013 Credit Facility	Mar. 31, 2013 Credit Facility Interest rate cap agreement	Mar. 31, 2013 Credit Facility Minimum	Mar. 31, 2013 Credit Facility Maximum	Mar. 31, 2013 Credit Facility Unsecured term loan	Dec. 09, 2011 Credit Facility Unsecured term loan maturing in December 2014	Mar. 31, 2013 Credit Facility Unsecured term loan maturing in March 2017	Dec. 09, 2011 Credit Facility Unsecured term loan maturing in March 2017	Dec. 09, 2011 Credit Facility Unsecured revolving facility maturing in December 2015
SECURED CREDIT FACILITY, UNSECURED CREDIT FACILITY AND SECURED TERM LOANS
Term of debt instrument															5 years					7 years
Maximum borrowing capacity															$ 100,000,000					$ 100,000,000										$ 100,000,000		$ 200,000,000	$ 300,000,000
Loan procurement costs capitalized							2,100,000
Interest rate, basis spread (as a percent)											1.48%	1.48%	1.75%	1.75%				1.45%	2.10%				1.60%	2.25%
Variable interest rate basis																LIBOR					LIBOR							LIBOR
Variable interest rate floor (as a percent)															0.00%					0.00%
Number of investment grade ratings						2
Unsecured term loan borrowings outstanding	500,000,000	500,000,000	30,000,000								200,000,000																		300,000,000
Remaining borrowing capacity													0												269,800,000				269,800,000		0
Outstanding letter of credit	200,000
Derivative, variable interest rate base								Thirty-day LIBOR																		LIBOR
Interest rate cap (as a percent)																										1.34%
Hedged amount				200,000,000
Interest rate swap (as a percent)																	1.80%					2.47%
Effective weighted average interest rate (as a percent)					3.18%																				3.18%
Total indebtedness to total asset value ratio (as a percent)										60.00%																		60.00%
Fixed charge coverage ratio									1.50																		1.50
Tangible net worth									$ 821,211,200																		$ 821,211,200
Net proceeds from equity issuances added to minimum tangible net worth (as a percent)					75.00%																				75.00%
Percentage of funds from operations that can be distributed on common shares										95.00%																		95.00%

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- Definition

Represents the fixed charge coverage ratio required by the financial covenant under the terms of the debt agreement.

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Represents the percentage of net proceeds from equity issuances added to the minimum tangible net worth in calculating the financial covenant per the terms of the debt agreement.

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Represents the minimum tangible net worth required by the financial covenant under the terms of the debt agreement.

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Represents the total indebtedness to total asset value coverage ratio required by the financial covenant under the terms of the debt agreement.

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Represents the number of credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency.

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Represents the percentage of funds from operations that can be distributed on common shares as a condition under the covenant.

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Represents the term of the debt instrument.

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Represents the floor for the variable rate base of the debt instrument.

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The percentage points added to the reference rate to compute the variable rate on the debt instrument.

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The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of debt outstanding by type or by instrument at that time.

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For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain. Such amount is before the consideration of accumulated amortization.

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-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 21

-Paragraph 16

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Amount of the hedged item as of the balance sheet date related to the derivative. For example, the hedged balance on a debt instrument.

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Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract.

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The reference rate for the variable rate of the interest rate derivative, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

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Fixed interest rate that will be received or paid upon exercise of the interest rate swaption contract.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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