SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Pronouncements Adopted (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change		$ (5,336)
Right of use asset - operating leases, net	$ 21,656		$ 0	$ 0
Lease Liability - operating leases	$ 22,554		$ 0
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change		(700)
Right of use asset - operating leases, net		22,400
Lease Liability - operating leases		$ 22,400