PROPERTY AND EQUIPMENT, NET Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Payments for (Proceeds from) Leasehold Improvements Funded by Tenant Allowance	$ 630
Property, Plant and Equipment, Gross	65,456	63,553
Less: acccumulated depreciation and amortization	51,352	49,731
Property and equipment, net	14,104	13,822
Property Plant and Equipment, Capital Expenditure Not Yet Placed in Service	1,277	595
Capital lease obligation, current	198	315
Capital lease obligation, non-current	3	9
Computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	9,505	9,395
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,322	6,379
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	28,152	26,963
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 21,477	$ 20,816