SIGNIFICANT ACCOUNTING POLICIES (Details 1) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Document Fiscal Year Focus	2018
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)	$ 2.14305	$ 2.49146	$ 2.10494
Nondividend distributions (in dollars per share)	0.00000	0.02686	0.05202
Unrecaptured Section 1250 capital gain (in dollars per share)	0.00000	0.00000	0.12872
Other capital gain (in dollars per share)	0.00000	0.00168	0.15432
Total Common Share Distributions	$ 2.14305	$ 2.52000	$ 2.44000