SEGMENT INFORMATION - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information
Revenue from contracts with customers	$ 255,311	$ 150,745
Operating (Loss) Income	(10,756)	1,388
Adjusted EBITDA	36,640	10,212
North America
Segment Reporting Information
Revenue from contracts with customers	236,026	138,072
Operating (Loss) Income	(5,365)	6,424
Adjusted EBITDA	39,605	14,184
Europe
Segment Reporting Information
Revenue from contracts with customers	19,285	12,673
Operating (Loss) Income	(5,391)	(5,036)
Adjusted EBITDA	$ (2,965)	$ (3,972)