PROPERTY AND EQUIPMENT

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT

Property and equipment at December 31, 2016 and 2015 consisted of the following (in thousands):

	2016			2015			Estimated Useful Lives (years)
Computer equipment and software	$	522,675		$	396,961		2 to 5 years
Leasehold improvements	143,191			109,724			2 to 11 years
Office equipment, furniture and fixtures	34,176			28,447			2 to 10 years
Building construction-in-progress	5,945			—
Total	705,987			535,132
Less: accumulated depreciation	(358,970		)	(260,346		)
Property and equipment, net	$	347,017		$	274,786

Fixed asset depreciation expense was approximately $140.1 million, $101.5 million and $78.2 million for the years ended December 31, 2016, 2015 and 2014, respectively.