PROPERTY AND EQUIPMENT, NET Property and Equipment, Net (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 51,786		$ 60,754
Less: acccumulated depreciation and amortization	43,558		50,914
Property and equipment, net	8,228		9,840
Capital expenditure not yet placed in service	460		1,006
Capital lease obligation, current	63		77
Capital lease obligation, non-current	286		348
Capital expenditures for landlord funded tenant improvements	0	$ 1,415
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,984		8,806
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,215		5,352
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24,846		25,228
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15,741		$ 21,368