RIGHT-OF-USE ASSETS AND OPERATING LEASE LIABILITIES - OPERATING LEASE LIABILITIES (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating lease liabilities
Remainder of 2019	$ 1,790
2020	7,037
2021	6,404
2022	5,136
2023	4,611
Thereafter	18,173
Total undiscounted cash flows	43,151
Discount applied to cash flows	(5,760)
Total discounted cash flows reported as operating lease liabilities	37,391
Related Party
Operating lease liabilities
Remainder of 2019	1,157
2020	4,585
2021	4,171
2022	3,310
2023	3,310
Thereafter	15,910
Total undiscounted cash flows	32,443
Discount applied to cash flows	(4,784)
Total discounted cash flows reported as operating lease liabilities	27,659
Third Party
Operating lease liabilities
Remainder of 2019	633
2020	2,452
2021	2,233
2022	1,826
2023	1,301
Thereafter	2,263
Total undiscounted cash flows	10,708
Discount applied to cash flows	(976)
Total discounted cash flows reported as operating lease liabilities	$ 9,732