SIGNIFICANT ACCOUNTING POLICIES (Details 1) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Class of Stock [Line Items]
Document Fiscal Year Focus	2016
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)	$ 2.10494	$ 2.24258	$ 2.02398
Nondividend distributions (in dollars per share)	0.05202	0.02774	0.08974
Unrecaptured Section 1250 capital gain (in dollars per share)	0.12872	0.06968	0.09470
Other capital gain (in dollars per share)	0.15432	0.00000	0.01158
Total Common Share Distributions	$ 2.44000	$ 2.34000	$ 2.22000