SIGNIFICANT ACCOUNTING POLICIES SIGNIFICANT ACCOUNTING POLICIES (Details 5) - USD ($)		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Indirect leasing costs		$ 411,000	$ 0	$ 0
Operating Lease, Lease Income		248,237,000
Operating Lease, Variable Lease Income	[1]	82,576,000
Income from real estate operations		330,813,000	299,018,000	$ 274,031,000
Operating Leases, Future Minimum Payments Receivable, Current		252,654,000	226,330,000
Operating Leases, Future Minimum Payments Receivable, in Two Years		215,820,000	195,850,000
Operating Leases, Future Minimum Payments Receivable, in Three Years		171,607,000	151,564,000
Operating Leases, Future Minimum Payments Receivable, in Four Years		132,274,000	112,007,000
Operating Leases, Future Minimum Payments Receivable, in Five Years		99,183,000	82,262,000
Operating Leases, Future Minimum Payments Receivable, Thereafter		171,392,000	163,499,000
Operating Leases, Future Minimum Payments Receivable		1,042,930,000	931,512,000
Right of use assets - Office Leases	[2]	2,115,000	0
Operating Lease, Right-of-Use Asset	[3]	$ 11,997,000	$ 0
Accounting Standards Update 2016-02 [Member]
Property, Plant and Equipment [Line Items]
Right of use assets - Office Leases					$ 2,376,000
Operating Lease, Right-of-Use Asset					$ 10,226,000
Right of use asset and lease liability for ground leases and office leases, estimated percentage of Total assets		less than 1%

[1] Primarily includes tenant reimbursements for real estate taxes, insurance and common area maintenance.

[2] See Note 1(o) for information regarding the Company’s January 1, 2019, implementation of FASB ASC 842, Leases, and the Company’s right of use assets for office leases.

[3] See Ground Leases discussion below and in Note 1(o) for information regarding the Company's right of use assets for ground leases.