LEASES - Schedule of Future Lease Payments (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases
2019 (remaining nine months)	$ 40,019
2020	44,558
2021	33,147
2022	26,081
2023	18,498
2024	12,525
Thereafter	26,037
Total future lease payments	200,865
Amount representing interest	(28,318)
Total lease liabilities	172,547
Finance Lease
2019 (remaining nine months)	1,307
2020	1,777
2021	1,813
2022	1,849
2023	1,886
2024	1,923
Thereafter	40,636
Total future lease payments	51,191
Amount representing interest	(26,981)
Total lease liabilities	$ 24,210