GOODWILL AND OTHER INTANGIBLE ASSETS, Estimated Future Annual Amortization of Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
The estimated future annual amortization of intangible assets for each of the next five years and thereafter [Abstract]
2018	$ 15,615
2019	14,170
2020	10,292
2021	8,911
2022	7,264
Thereafter	22,273
Carrying amount, net	78,525	$ 94,831	$ 112,297
Customer Relationships [Member]
The estimated future annual amortization of intangible assets for each of the next five years and thereafter [Abstract]
Carrying amount, net	$ 78,394	94,576
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining estimated life	8 years 3 months 18 days
Non-Compete Agreements [Member]
The estimated future annual amortization of intangible assets for each of the next five years and thereafter [Abstract]
Carrying amount, net	$ 131	$ 255
Finite-Lived Intangible Assets [Line Items]
Weighted average remaining estimated life	1 year 9 months 18 days