GOODWILL AND OTHER INTANGIBLE ASSETS, Amortizable Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 197,922	$ 197,395
Accumulated amortization	(98,260)	(85,098)
Carrying amount, net	99,662	112,297
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	196,079	195,580
Accumulated amortization	(96,716)	(83,741)
Carrying amount, net	99,363	111,839
Non-Compete Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,843	1,815
Accumulated amortization	(1,544)	(1,357)
Carrying amount, net	$ 299	$ 458