RESTRUCTURING, ACQUISITION, INTEGRATION, AND OTHER EXPENSES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Change in fair value of contingent consideration	$ 0	$ 0	$ (4,597)
Total restructuring, acquisition, integration, and other expenses	6,457	12,662	15,859
Financial Improvement Plan
Restructuring Cost and Reserve [Line Items]
Restructuring and other expense	4,934	12,134	10,334
Acquisition and integration expenses	1,523	528	10,122
Change in fair value of contingent consideration	0	0	(4,597)
Total restructuring, acquisition, integration, and other expenses	$ 6,457	$ 12,662	$ 15,859