Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Measurements

Schedule of financial assets and liabilities which are required to be measured at fair value

The following table presents, for each of the fair value hierarchy levels identified under ASC 820, our financial assets and certain liabilities that are required to be measured at fair value at December 31, 2017 and 2016 (in thousands):

			Fair Value Measurements at Reporting Date
					Significant
	Amount		Quoted Prices		Other		Significant
	Recorded		in Active Markets		Observable		Unobservable
	on Balance		for Identical Assets		Inputs		Inputs
	Sheet		(Level 1)		(Level 2)		(Level 3)
Assets as of December 31, 2017:
Cash and cash equivalents	$	170,385	$	170,385	$	—	$	—
Liabilities as of December 31, 2017:
Contingent consideration	$	716	$	—	$	—	$	716
Assets as of December 31, 2016:
Cash and cash equivalents	$	135,823	$	135,823	$	—	$	—
Liabilities as of December 31, 2016:
None

Schedule of changes to the Company's contingent consideration liability Level 3 fair value measurements

The following table provides changes to our contingent consideration liability Level 3 fair value measurements during the years ended December 31, 2017 and 2016 (in thousands):

	Significant Unobservable Inputs
	(Level 3)
Contingent Consideration Liability	2017		2016
Beginning balance, January 1,	$	—	$	—
Florida Gas Contractors acquisition		1,200		—
Change in fair value of contingent consideration liability during year		(484)		—
Ending balance, December 31,	$	716	$	—