Property and equipment: (Tables)

12 Months Ended

Dec. 31, 2021

Property and equipment:

Schedule of property and equipment

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

	December 31,
	2021		2020
Owned assets:
Network equipment	$	650,634	$	611,265
Leasehold improvements		250,623		241,379
System infrastructure		160,376		148,533
Software		11,028		10,609
Office and other equipment		20,999		19,611
Building		1,273		1,376
Land		107		116
		1,095,040		1,032,889
Less—Accumulated depreciation and amortization		(912,579)		(856,859)
		182,461		176,030
Assets under finance leases:
IRUs		524,475		482,978
Less—Accumulated depreciation and amortization		(249,056)		(228,673)
		275,419		254,305
Property and equipment, net	$	457,880	$	430,335