PROPERTY, PLANT AND EQUIPMENT (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, plant and equipment
Property, plant and equipment, gross	$ 191,668	$ 192,517
Accumulated depreciation	(119,770)	(117,861)
Property, plant and equipment, net	71,898	74,656
Land, buildings and improvements
Property, plant and equipment
Property, plant and equipment, gross	88,461	88,295
Machinery, equipment and fixtures
Property, plant and equipment
Property, plant and equipment, gross	80,268	80,584
Office furniture, equipment and vehicles
Property, plant and equipment
Property, plant and equipment, gross	22,827	23,421
Construction in progress
Property, plant and equipment
Property, plant and equipment, gross	$ 112	$ 217