PROPERTY AND EQUIPMENT (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Property and equipment	$ 176,988,000		$ 169,565,000
Less: accumulated depreciation and amortization	(158,901,000)		(150,894,000)
Net property and equipment	18,087,000		18,671,000
Depreciation expense	8,500,000		13,800,000		15,800,000
Construction-in-progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	3,589,000	[1]	1,214,000	[1]
Equipment and furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	124,789,000		119,848,000
Building and leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment	$ 48,610,000		$ 48,503,000

[1] Includes assets received not yet in service.