SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES (Details 5) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets	$ 104,830	$ 91,858
Assets	1,825,764	1,661,904
Secured debt	257,505	350,285
Unsecured debt	652,838	528,210
Unsecured bank credit facilities	190,990	149,414
Liabilities	1,183,898	1,102,703
Liabilities and Equity	$ 1,825,764	1,661,904
Accounting Standards Update 2015-03 SImplifying the Presentation of Debt Issuance Costs [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets		91,858
Assets		1,661,904
Secured debt		350,285
Unsecured debt		528,210
Unsecured bank credit facilities		149,414
Liabilities		1,102,703
Liabilities and Equity		1,661,904
Accounting Standards Update 2015-03 SImplifying the Presentation of Debt Issuance Costs [Member] | Balance prior to change in accounting principle [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets		96,186
Assets		1,666,232
Secured debt		351,401
Unsecured debt		530,000
Unsecured bank credit facilities		150,836
Liabilities		1,107,031
Liabilities and Equity		$ 1,666,232