FIXED ASSETS (Components of Fixed Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 88,781	$ 78,686
Accumulated depreciation	(57,932)	(51,835)
Property, plant and equipment, net, total	30,849	26,851
Furniture and fixtures [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	5,701	5,673
Computer hardware and software [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	68,387	59,035
Equipment [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,326	2,621
Leasehold improvements [Member]
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 11,367	$ 11,357