PROPERTY AND EQUIPMENT, NET Property and Equipment, Net (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 80,120		$ 75,928
Less: acccumulated depreciation and amortization	58,931		58,090
Property and equipment, net	21,189		17,838
Property Plant and Equipment, Capital Expenditure Not Yet Placed in Service	487		1,137
Capital lease obligation, current	451		420
Capital lease obligation, non-current	561		720
Capital Lease Obligations Incurred	58	0
Noncash or Part Noncash Acquisition, Fixed Assets Acquired	3,949
Computer equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	13,498		13,666
Furniture and equipment
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	9,663		9,692
Capitalized software costs
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	32,494		30,920
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 24,465		$ 21,650

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid within one year (or one operating cycle, if longer) of the balance sheet date.

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal, through the balance sheet date and due to be paid more than one year (or one operating cycle, if longer) after the balance sheet date.

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- Definition

The amount of fixed assets that an Entity acquires in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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- Definition

Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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