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STOCKHOLDERS' EQUITY (Details 2) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 5 Months Ended | 0 Months Ended | 1 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 28, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Jun. 30, 2010 Maximum | Dec. 31, 2012 Maximum | Aug. 09, 2012 Equity Offering Program | Dec. 31, 2012 Equity Offering Program | Feb. 11, 2011 Public Offering item | Mar. 31, 2011 Public Offering
Stockholders' Equity |  |  |  |  |  |  |  |  |  |
Cash distributions declared per share of common stock (in dollars per share) |  | $ 1.34 | $ 1.32 | $ 1.23 |  |  |  |  |  |
Discount rate (as a percent) |  | 5.00% |  |  | 5.00% | 5.00% |  |  |  |
Common shares issued under the Distribution Reinvestment Plan |  | 214,620 | 254,502 | 81,154 |  |  |  |  |  |
Maximum aggregate sales price of shares to be sold under an Equity Offering Sales Agreement (in dollars) |  |  |  |  |  |  | $ 50,000,000 |  |  |
Number of shares sold | 2,700,000 |  |  |  |  |  |  | 120,844 | 2,700,000 |
Proceeds from sale of shares |  | 2,131,000 | 40,569,000 |  |  |  |  | 2,296,041 | 40,569,000 |
Payment of commissions on sale of shares |  |  |  |  |  |  |  | 23,000 |  |
Payment of offering costs on sale of shares |  |  |  |  |  |  |  | 165,000 |  |
Number of mortgages to be repaid |  |  |  |  |  |  |  |  | 2 |
Repayment of mortgages payable |  | 32,422,000 | 15,302,000 | 10,689,000 |  |  |  |  | 7,700,000 |
Weighted average interest rate (as a percent) |  |  |  |  |  |  |  |  | 7.90% |
Decrease in outstanding amount |  | 34,550,000 | 44,700,000 | 19,500,000 |  |  |  |  | 26,200,000 |
Payments made to purchase a property |  | $ 44,616,000 | $ 28,000,000 | $ 72,300,000 |  |  |  |  |  | $ 2,325,000

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