Operating expenses (Tables)

6 Months Ended

Jun. 30, 2020

Operating expenses

Schedule of Direct Operating Expenses

	Three months ended				Six months ended
	June 30,				June 30,
	2020		2019		2020		2019
Ancillary and logistical service expenses	$	16,060	$	16,472	$	28,818	$	30,231
Employee compensation expenses		11,311		14,906		23,615		25,713
Buildings, facilities and technology expenses		2,076		2,172		6,115		4,306
Travel, advertising and promotion expenses		6,161		12,807		12,736		18,675
Other costs of services		3,840		3,911		7,519		7,412
	$	39,448	$	50,268	$	78,803	$	86,337

Schedule of Selling, General and Administrative Expenses

	Three months ended				Six months ended
	June 30,				June 30,
	2020		2019		2020		2019
Employee compensation expenses	$	70,807	$	63,889	$	133,302	$	125,353
Buildings, facilities and technology expenses		14,616		14,582		30,207		30,497
Travel, advertising and promotion expenses		4,817		9,225		15,086		18,367
Professional fees		4,577		4,155		9,024		8,230
Other SG&A expenses		5,815		5,863		11,398		10,451
	$	100,632	$	97,714	$	199,017	$	192,898

Schedule of Depreciation and Amortization Expenses

	Three months ended				Six months ended
	June 30,				June 30,
	2020		2019		2020		2019
Depreciation expense	$	7,536	$	7,157	$	15,573	$	14,325
Amortization expense		10,321		9,955		21,577		19,902
	$	17,857	$	17,112	$	37,150	$	34,227