SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Balances Related to Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 124,900	$ 177,900
Less accumulated depreciation	(95,472)	(146,814)
Property and equipment, net	29,449	31,122
Building and Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	8,700	7,800
Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	53,400	72,900
Capital Leases [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	2,900	0
Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 59,900	$ 97,200

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-SubTopic 10
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Amount before accumulated depreciation, depletion and amortization of 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, and furniture and fixtures.

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