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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Investments in Unconsolidated Affiliates (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]      
Impairments of investments $ 0 $ 1,022,000 $ 0
Gain on Sale of Investments $ 67,242,000   $ 6,197,000