COST OF REVENUE

Cost of revenue principally includes payroll and employee benefits associated with personnel employed in customer service and operations roles, fees paid to external providers related to the provision of services, reimbursable expenses, technology and telecommunications expenses as well as depreciation and amortization of operating assets. The components of cost of revenue were as follows for the years ended December 31:



(in thousands)	2014		2013		2012

Compensation and benefits	$	255,889	$	156,812	$	113,145
Outside fees and services	243,325		193,233		123,338
Reimbursable expenses	137,634		102,478		96,147
Technology and telecommunications	48,834		25,534		23,404
Depreciation and amortization	21,498		14,423		10,167

Total	$	707,180	$	492,480	$	366,201