Fixed Assets, Net (Tables)

12 Months Ended

Dec. 31, 2018

Property Plant And Equipment [Abstract]

Components of Fixed Assets, Net

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

	December 31, 2018			December 31, 2017
Computer and communications equipment	$	140,451		$	135,622
Software, including software development costs		194,470			146,615
Leasehold improvements and other fixed assets		127,349			101,866
		462,270			384,103
Less: accumulated depreciation and amortization		(305,101	)		(259,577	)
Fixed assets, net	$	157,169		$	124,526