RIGHT-OF-USE ASSETS AND OPERATING LEASE LIABILITIES - OPERATING LEASE LIABILITIES (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating lease liabilities
Remainder of 2020	$ 5,338
2021	6,554
2022	5,287
2023	4,767
2024	4,213
Thereafter	14,623
Total undiscounted cash flows	40,782
Discount applied to cash flows	(5,245)
Total discounted cash flows reported as operating lease liabilities	35,537	$ 36,530
Related Party
Operating lease liabilities
Remainder of 2020	3,445
2021	4,194
2022	3,332
2023	3,332
2024	3,205
Thereafter	12,718
Total undiscounted cash flows	30,226
Discount applied to cash flows	(4,324)
Total discounted cash flows reported as operating lease liabilities	25,902
Third Party
Operating lease liabilities
Remainder of 2020	1,893
2021	2,360
2022	1,955
2023	1,435
2024	1,008
Thereafter	1,905
Total undiscounted cash flows	10,556
Discount applied to cash flows	(921)
Total discounted cash flows reported as operating lease liabilities	$ 9,635