LEASES AND RELATED PARTY LEASES - Future Minimum Lease Payment Under Operating Leases, After Adoption of 842 (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leased Assets [Line Items]
2019	$ 11,863
2020	12,705
2021	11,828
2022	9,450
2023	7,578
Thereafter	42,617
Total minimum lease payments	96,041
Less: Imputed interest	21,711
Total lease liabilities	74,330
Less: Current lease liabilities	12,619
Long-term lease liabilities	61,711
Related Parties
Operating Leased Assets [Line Items]
2019	222
2020	296
2021	296
2022	296
2023	296
Thereafter	1,724
Total minimum lease payments	3,130
Third Parties
Operating Leased Assets [Line Items]
2019	11,641
2020	12,409
2021	11,532
2022	9,154
2023	7,282
Thereafter	40,893
Total minimum lease payments	$ 92,911