PROPERTY, PLANT & EQUIPMENT (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 126,995	$ 125,035
Less accumulated depreciation	(98,690)	(92,501)
Less accumulated amortization under capital lease	(5,029)	(2,170)
Total property, plant and equipment, net	23,276	30,364
Depreciation expense	11,100	12,408
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	20,582	20,966
Telephone and computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,298	38,925
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,626	35,162
Furniture, fixtures, and miscellaneous equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,341	15,359
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,618	1,041
Assets acquired under capital lease
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 13,530	$ 13,582