PROPERTY AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Schedule of property and equipment

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

	December 31,
	2018			2017
Network equipment	$	274,322		$	247,190
Network equipment under capital lease	14,206			14,206
Furniture and equipment	28,583			26,246
Software	66,924			43,930
Leasehold improvements	414,212			412,631
Buildings under capital lease	269,455			227,482
Property and equipment, gross	1,067,701			971,685
Less: accumulated depreciation and amortization ($55,198 and $50,253 related to capital leases at December 31, 2018 and 2017, respectively)	(589,640		)	(513,120		)
	$	478,061		$	458,565

Schedule of summary of depreciation and amortization of property and equipment associated with direct costs

Depreciation and amortization of property and equipment consisted of the following (in thousands): 

	Year ended December 31,
	2018		2017		2016
Costs of sales and services	$	75,998	$	70,368	$	71,626
Other depreciation and amortization	10,644		2,478		2,274
Subtotal	86,642		72,846		73,900
Amortization of acquired and developed technologies	4,034		2,147		3,048
Total depreciation and amortization	$	90,676	$	74,993	$	76,948