Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Depreciation Expense Computed Using Straight-Line Method over Useful Lives

Depreciation is computed using the straight-line method over the following useful lives:

Computer hardware	2 to 3 years
Computer software	2 to 5 years
Furniture and equipment	3 to 5 years
Leasehold improvements	Term of lease

Property and equipment consisted of the following (in thousands):

	December 31,
	2019		2018
Computer hardware	$	164,547	$	177,237
Computer software	291,681		378,734
Furniture and equipment	88,136		117,740
Leasehold improvements	150,644		160,521
Property and equipment, cost	695,008		834,232
Accumulated depreciation	(566,623)		(709,056)
Property and equipment, net	$	128,385	$	125,176