PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE - Schedule of property, plant, and equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	$ 345,357	$ 290,207
Less: accumulated depreciation and amortization	(197,616)	(148,449)
Property, equipment and capitalized software, net	147,741	141,758
Office and computer equipment
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	81,090	76,748
Leasehold improvements
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	14,936	13,158
Purchased software
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	51,784	45,304
Capitalized software
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	166,995	128,356
Furniture and fixtures
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	7,934	6,412
Land
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	390	390
Building
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	14,028	14,028
Work in process
PROPERTY, EQUIPMENT AND CAPITALIZED SOFTWARE
Total	$ 8,200	$ 5,811

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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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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