Operating expenses (Tables)

9 Months Ended

Sep. 30, 2021

Operating expenses

Schedule of Direct Operating Expenses

	Three months ended				Nine months ended
	September 30,				September 30,
	2021		2020		2021		2020
Ancillary and logistical service expenses	$	11,433	$	16,550	$	38,521	$	45,368
Employee compensation expenses		12,182		11,442		37,567		35,057
Buildings, facilities and technology expenses		2,496		1,653		7,501		7,768
Travel, advertising and promotion expenses		3,205		4,782		13,022		17,518
Other costs of services		3,722		4,796		11,496		12,315
	$	33,038	$	39,223	$	108,107	$	118,026

Schedule of Selling, General and Administrative Expenses

	Three months ended				Nine months ended
	September 30,				September 30,
	2021		2020		2021		2020
Wages, salaries and benefits	$	66,880	$	69,862	$	215,867	$	194,403
Share-based compensation expense		5,627		8,568		16,945		17,329
Buildings, facilities and technology expenses		18,213		15,901		53,035		46,108
Travel, advertising and promotion expenses		6,541		5,479		18,527		20,565
Professional fees		6,323		4,546		16,557		13,570
Other SG&A expenses		4,994		5,830		15,544		17,228
	$	108,578	$	110,186	$	336,475	$	309,203

Schedule of Depreciation and Amortization Expenses

	Three months ended				Nine months ended
	September 30,				September 30,
	2021		2020		2021		2020
Depreciation expense	$	8,127	$	7,705	$	24,309	$	23,278
Amortization expense		13,780		10,731		40,603		32,308
	$	21,907	$	18,436	$	64,912	$	55,586