GOODWILL AND INTANGIBLE ASSETS - Other Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Intangible Assets, Net
Intangible Assets	$ 224,662		$ 224,662		$ 122,806
Accumulated Amortization	(37,805)		(37,805)		(29,686)
Intangible Assets, net	186,857		186,857		93,120
Foreign currency translation adjustment, Intangible asset, Gross	96		96		306
Foreign currency translation adjustment, Intangible asset, net	96		96		306
Amortization of intangible assets	6,239	$ 1,442	8,133	$ 2,884
Future estimated amortization expense
2018	16,600		16,600
2019	14,800		14,800
2020	13,600		13,600
2021	12,800		12,800
2022	12,100		12,100
Trade names
Indefinite-Lived Intangible Assets (Excluding Goodwill) [Abstract]
Indefinite lived intangible assets	76,050		76,050		41,180
Future estimated amortization expense
Impairment charge	2,800
Non-competition agreements
Intangible Assets, Net
Intangible Assets	31,290		31,290		12,230
Accumulated Amortization	(9,316)		(9,316)		(5,765)
Intangible Assets, net	21,974		$ 21,974		6,465
Weighted average remaining useful lives			3 years 4 months 24 days
Customer relationships
Intangible Assets, Net
Intangible Assets	117,226		$ 117,226		69,090
Accumulated Amortization	(28,489)		(28,489)		(23,921)
Intangible Assets, net	$ 88,737		$ 88,737		$ 45,169
Weighted average remaining useful lives			10 years 7 months 21 days