LEASES - Operating Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019 (excluding the six months ended June 30, 2019)	$ 11,623
2019		$ 23,315
2020	18,951	16,858
2021	13,690	12,577
2022	11,320	9,873
2023	9,102	7,846
Thereafter	24,356	23,224
Total future minimum lease payments	89,042	$ 93,693
Less: Interest	(17,783)
Present value of lease liabilities	$ 71,259