LEASES - Future minimum lease payments for operating and capital leases under ASC 840 (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Operating leases
2020	$ 5,574
2021	4,558
2022	3,950
2023	3,270
2024 and thereafter	8,443
Total minimum lease payments	25,795
Finance leases
2020	2,518
2021	2,930
2022	3,012
2023	3,094
2024 and thereafter	31,499
Total minimum lease payments	43,053
Less: amounts representing interest	11,241
Present value of net minimum lease payments	31,812
Less: Current portion of lease obligations	1,832
Non-current portion of lease obligations	$ 29,980