PROPERTY AND EQUIPMENT (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment		$ 181,870	$ 176,988
Less: accumulated depreciation and amortization		(160,870)	(158,901)
Net property and equipment		21,000	18,087
Depreciation expense		7,000	8,500	$ 13,800
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	[1]	2,433	3,589
Equipment and furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment		133,215	124,789
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment		$ 46,222	$ 48,610

[1] Includes assets received but not yet in service.