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 costs 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)	2015		2014		2013

Compensation and benefits	$	261,839	$	255,889	$	156,812
Outside fees and services	248,278		243,325		193,233
Reimbursable expenses	107,344		137,634		102,478
Technology and telecommunications	43,177		48,834		25,534
Depreciation and amortization	26,689		21,498		14,423

Total	$	687,327	$	707,180	$	492,480