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IDENTIFIED INTANGIBLE ASSETS AND LIABILITIES - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]      
Identified intangible assets, net of accumulated amortization $ 68,422 $ 87,249  
Identified intangible liabilities, net of accumulated amortization 144,258 180,959  
Amortization of acquired below-market leases, net of above-market leases 34,000 9,500 $ 7,800
Amortization expense of intangible assets 15,100 9,300 2,000
Amortization of below-market Lease $ 1,000 $ 1,000 $ 1,000