Operating Expenses

6 Months Ended

Jun. 30, 2019

Operating Expenses [Abstract]

Operating Expenses

6.    Operating expenses

Costs of services

	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Ancillary and logistical service expenses	$	16,472	$	19,980	$	30,231	$	34,560
Employee compensation expenses		14,906		10,931		25,713		19,950
Buildings, facilities and technology expenses		2,172		2,663		4,306		5,290
Travel, advertising and promotion expenses		12,807		7,806		18,675		14,614
Other costs of services		3,911		1,653		7,412		5,276
	$	50,268	$	43,033	$	86,337	$	79,690

SG&A expenses

	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Employee compensation expenses	$	63,889		66,699	$	125,353	$	129,992
Buildings, facilities and technology expenses		14,582		15,436		30,497		30,709
Travel, advertising and promotion expenses		9,225		8,800		18,367		18,519
Professional fees		4,155		5,388		8,230		9,655
Other SG&A expenses		5,863		4,936		10,451		9,854
	$	97,714	$	101,259	$	192,898	$	198,729

Acquisition-related costs

Acquisition-related costs consist of operating expenses directly incurred as part of a business combination, due diligence and integration planning related to the IronPlanet acquisition, and continuing employment costs that are recognized separately from our business combinations.

	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
IronPlanet:
Other acquisition-related costs	$	—	$	456	$	82	$	1,095
Other acquisitions:
Continuing employment costs		—		885		87		1,853
Other acquisition-related costs		38		58		538		84
	$	38	$	1,399	$	707	$	3,032

Depreciation and amortization expenses

	Three months ended				Six months ended
	June 30,				June 30,
	2019		2018		2019		2018
Depreciation expense	$	7,157	$	7,292	$	14,325	$	14,208
Amortization expense		9,955		9,245		19,902		18,520
	$	17,112	$	16,537	$	34,227	$	32,728