Detail of Certain Balance Sheet Accounts

12 Months Ended

Dec. 31, 2015

8. Detail of Certain Balance Sheet Accounts

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

	December 31,
	2015			2014			2013
Balance at beginning of year	$	4,379		$	4,460		$	6,333
Additions for bad debt expense		1,552			1,275			19
Deductions for uncollectible receivables written off, net of recoveries		(798	)		(1,650	)		(1,892	)
Allowance for doubtful accounts of acquired companies at date of acquisition		25			294			—

Balance at end of year	$	5,158		$	4,379		$	4,460

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

	December 31,
	2015		2014
Accrued warranty costs	$	7,746	$	7,227
Accrued job losses		1,365		1,329
Accrued rent and lease obligations		891		953
Accrued sales and use tax		2,216		1,945
Deferred revenue		2,175		1,538
Liabilities due to former owners		2,650		520
Other current liabilities		11,634		11,001

	$	28,677	$	24,513