LEASES - Operating Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019 (excluding the three months ended March 31, 2019)	$ 17,911
2019		$ 23,315
2020	18,517	16,858
2021	13,411	12,577
2022	11,182	9,873
2023	9,118	7,846
Thereafter	23,918	23,224
Total future minimum lease payments	94,057	$ 93,693
Less: Interest	(21,439)
Present value of lease liabilities	$ 72,618