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Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Property and Equipment
Property and equipment	$ 190,203		$ 190,203		$ 176,946
Less accumulated depreciation	(121,853)		(121,853)		(100,758)
Property and equipment, net	68,350		68,350		76,188
Depreciation expense	10,500	$ 9,900	21,100	$ 19,400
Capitalized amount	5,800	6,200	12,300	15,800
Amortization expense	7,500	$ 6,000	14,800	$ 11,400
Internal use software	45,900		45,900		48,500
Computer equipment and software
Property and Equipment
Property and equipment	161,294		161,294		148,104
Furniture and fixtures
Property and Equipment
Property and equipment	10,089		10,089		10,020
Leasehold improvements
Property and Equipment
Property and equipment	$ 18,820		$ 18,820		$ 18,822

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- Definition

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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Additions made to capitalized computer software costs during the period.

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