Fixed Assets, Net (Tables)

3 Months Ended

Mar. 31, 2018

Property Plant And Equipment [Abstract]

Components of Fixed Assets, Net

Fixed assets, net consisted of the following (in thousands):

	March 31, 2018			December 31, 2017
Computer and communications equipment	$	154,171		$	151,499
Software, including software development costs		175,280			164,011
Leasehold improvements and other fixed assets		186,952			179,178
		516,403			494,688
Less: accumulated depreciation and amortization		(319,497	)		(305,341	)
Fixed assets, net	$	196,906		$	189,347