PROPERTY AND EQUIPMENT, NET Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Capital Lease Obligations Incurred	$ 437
Payments for (Proceeds from) Leasehold Improvements Funded by Tenant Allowance	1,415
Property, Plant and Equipment, Gross	68,181	63,552
Less: acccumulated depreciation and amortization	53,281	49,730
Property and equipment, net	14,900	13,822
Property Plant and Equipment, Capital Expenditure Not Yet Placed in Service	1,871	595
Capital lease obligation, current	153	315
Capital lease obligation, non-current	350	9
Computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	10,190	9,395
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	6,440	6,379
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	28,603	26,962
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 22,948	$ 20,816