Operating expenses (Tables)

3 Months Ended

Mar. 31, 2020

Operating expenses

Schedule of Direct Operating Expenses

	Three months ended
	March 31,
	2020		2019
Ancillary and logistical service expenses	$	12,758	$	13,759
Employee compensation expenses		12,304		10,807
Buildings, facilities and technology expenses		4,039		2,134
Travel, advertising and promotion expenses		6,575		5,868
Other costs of services		3,679		3,501
	$	39,355	$	36,069

Schedule of Selling, General and Administrative Expenses

	Three months ended
	March 31,
	2020		2019
Employee compensation expenses	$	62,495	$	61,464
Buildings, facilities and technology expenses		15,591		15,915
Travel, advertising and promotion expenses		10,269		9,142
Professional fees		4,447		4,075
Other SG&A expenses		5,583		4,588
	$	98,385	$	95,184

Schedule of Depreciation and Amortization Expenses

	Three months ended
	March 31,
	2020		2019
Depreciation expense	$	8,037	$	7,168
Amortization expense		11,256		9,947
	$	19,293	$	17,115