LEASES - Supplemental cash flow information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 889
Operating cash flows from finance leases	15
Financing cash flows from finance leases	393
Right-of-use assets obtained in exchange for lease obligations:
Finance leases	415
Operating leases	$ 26,429