GOODWILL AND OTHER INTANGIBLE ASSETS - Intangibles (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
GOODWILL AND OTHER INTANGIBLE ASSETS
Definite-lived, Gross Carrying Amount	$ 45,559		$ 45,559		$ 52,259
Definite-lived, Accumulated Amortization	(33,222)		(33,222)		(34,619)
Definite-lived, Net Carrying Amount	12,337		12,337		17,640
Total other intangible assets, Gross Carrying Amount	54,629		54,629		61,329
Total other intangible assets, Accumulated Impairment	(4,770)		(4,770)		(4,770)
Total other intangible assets, Net Carrying Amount	16,637		16,637		21,940
Amortization expense	1,500	$ 2,300	5,300	$ 7,200
Trade Name
GOODWILL AND OTHER INTANGIBLE ASSETS
Indefinite life, Gross Carrying Amount	9,070		9,070		9,070
Indefinite life, Accumulated Impairment	(4,770)		(4,770)		(4,770)
Indefinite life, Net Carrying Amount	4,300		4,300		4,300
Customer lists
GOODWILL AND OTHER INTANGIBLE ASSETS
Definite-lived, Gross Carrying Amount	30,563		30,563		36,439
Definite-lived, Accumulated Amortization	(22,671)		(22,671)		(24,267)
Definite-lived, Net Carrying Amount	7,892		7,892		12,172
Other intangible assets
GOODWILL AND OTHER INTANGIBLE ASSETS
Definite-lived, Gross Carrying Amount	14,996		14,996		15,820
Definite-lived, Accumulated Amortization	(10,551)		(10,551)		(10,352)
Definite-lived, Net Carrying Amount	$ 4,445		$ 4,445		$ 5,468