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Grants to Trustees	12 Months Ended
Grants to Trustees	Dec. 31, 2012
Grants to Trustees [Abstract]
GRANTS TO TRUSTEES	GRANTS TO TRUSTEES On May 22, 2012, each of our four independent trustees was granted 1,500 common shares, which vested immediately. The 6,000 common shares granted to our four independent trustees had a grant date fair value of $13.03 per share. On June 25, 2012, two of our independent trustees elected to receive a total of 915 common shares with a grant date fair value of $13.39 in lieu of cash for board fees. The fair value of the shares granted during the year ended December 31, 2012 was determined using quoted prices available on the date of grant.