FIXED ASSETS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
FIXED ASSETS
Total fixed assets, Gross	$ 171,777	$ 160,825
Less: accumulated depreciation and amortization	(150,740)	(135,503)
Total fixed assets	21,037	25,322
Depreciation and amortization	16,009	16,350	14,580
Computer hardware and software, including internal-use software and website development
FIXED ASSETS
Total fixed assets, Gross	151,155	141,435
Furniture and equipment
FIXED ASSETS
Total fixed assets, Gross	14,283	13,945
Leasehold improvements
FIXED ASSETS
Total fixed assets, Gross	6,339	5,445
Equipment under capital leases
FIXED ASSETS
Total fixed assets, Gross	1,700	1,700
Less: accumulated depreciation and amortization	$ 1,700	$ 1,500

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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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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