PROPERTY AND EQUIPMENT

12 Months Ended

Dec. 31, 2015

Property, Plant and Equipment [Abstract]

PROPERTY AND EQUIPMENT

PROPERTY AND EQUIPMENT

Property and equipment at December 31, 2015 and 2014 consisted of the following (in thousands):

	2015			2014			Estimated Useful Lives (years)
Computer equipment and software	$	396,961		$	332,650		2 to 5 years
Office equipment, furniture, fixtures & leasehold improvements	138,171			110,297			2 to 11 years
Total	535,132			442,947
Less: accumulated depreciation and amortization	(260,346		)	(243,994		)
Property and equipment, net	$	274,786		$	198,953

Fixed asset depreciation and amortization expense was approximately $101.5 million, $78.2 million and $48.4 million for the years ended December 31, 2015, 2014 and 2013, respectively. Asset retirements in the amount of $75.0 million during 2015 impacted the December 31, 2015 balances for gross property and equipment and accumulated depreciation and amortization.