SIGNIFICANT ACCOUNTING POLICIES (Details 1) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Document Fiscal Year Focus	2015
Federal Income Tax Treatment of Share Distributions [Abstract]
Ordinary taxable income distribution requirement	90.00%
Common Stock
Federal Income Tax Treatment of Share Distributions [Abstract]
Ordinary dividends (in dollars per share)	$ 2.24258	$ 2.02398	$ 1.91678
Nondividend distributions (in dollars per share)	0.02774	0.08974	0.21054
Unrecaptured Section 1250 capital gain (in dollars per share)	0.06968	0.09470	0.00270
Other capital gain (in dollars per share)	0.00000	0.01158	0.00998
Total Common Share Distributions	$ 2.34000	$ 2.22000	$ 2.14000