RIGHT-OF-USE ASSETS AND OPERATING LEASE LIABILITIES - OPERATING LEASE LIABILITIES (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating lease liabilities
Remainder of 2020	$ 3,628
2021	6,719
2022	5,452
2023	4,932
2024	4,378
Thereafter	16,094
Total undiscounted cash flows	41,203
Discount applied to cash flows	(5,632)
Total discounted cash flows reported as operating lease liabilities	35,571	$ 36,530
Related Party
Operating lease liabilities
Remainder of 2020	2,283
2021	4,194
2022	3,332
2023	3,332
2024	3,205
Thereafter	12,718
Total undiscounted cash flows	29,064
Discount applied to cash flows	(4,103)
Total discounted cash flows reported as operating lease liabilities	24,961
Third Party
Operating lease liabilities
Remainder of 2020	1,345
2021	2,525
2022	2,120
2023	1,600
2024	1,173
Thereafter	3,376
Total undiscounted cash flows	12,139
Discount applied to cash flows	(1,529)
Total discounted cash flows reported as operating lease liabilities	$ 10,610