Operating expenses (Tables)

3 Months Ended

Mar. 31, 2021

Operating expenses

Schedule of Direct Operating Expenses

	Three months ended
	March 31,
	2021		2020
Ancillary and logistical service expenses	$	12,269	$	12,758
Employee compensation expenses		12,691		12,304
Buildings, facilities and technology expenses		2,701		4,039
Travel, advertising and promotion expenses		4,518		6,575
Other costs of services		3,848		3,679
	$	36,027	$	39,355

Schedule of Selling, General and Administrative Expenses

	Three months ended
	March 31,
	2021		2020
Wages, salaries and benefits	$	78,796	$	60,088
Share-based compensation expense		3,778		2,407
Buildings, facilities and technology expenses		17,343		15,591
Travel, advertising and promotion expenses		5,162		10,269
Professional fees		5,032		4,447
Other SG&A expenses		5,967		5,583
	$	116,078	$	98,385

Schedule of Depreciation and Amortization Expenses

	Three months ended
	March 31,
	2021		2020
Depreciation expense	$	7,837	$	8,037
Amortization expense		13,233		11,256
	$	21,070	$	19,293