RESTRUCTURING, ACQUISITION, INTERGRATION, AND OTHER EXPENSES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring and Related Activities [Abstract]
Restructuring expense	$ 1,685	$ 1,879
Acquisition and integration expense	0	3
Merger expenses	4,336	0
Total restructuring, acquisition, integration, and other expenses	$ 6,021	$ 1,882