Detail of Certain Balance Sheet Accounts (Tables)

12 Months Ended

Dec. 31, 2018

Detail of Certain Balance Sheet Accounts

Schedule of activity in allowance for doubtful accounts

Activity in our allowance for doubtful accounts consists of the following (in thousands):

	December 31,
	2018		2017		2016
Balance at beginning of year	$	3,400	$	4,288	$	5,158
Bad debt expense (benefit)		3,562		182		(27)
Deductions for uncollectible receivables written off, net of recoveries		(1,304)		(1,829)		(876)
Allowance for doubtful accounts of acquired companies at date of acquisition		240		759		33
Balance at end of year	$	5,898	$	3,400	$	4,288

Schedule of other current liabilities

Other current liabilities consist of the following (in thousands):

	December 31,
	2018		2017
Accrued warranty costs	$	6,453	$	6,149
Accrued job losses		1,495		598
Accrued sales and use tax		2,685		2,308
Deferred revenue		5,233		3,895
Liabilities due to former owners		2,045		2,981
Other current liabilities		14,941		17,723
	$	32,852	$	33,654