Fair Value Measurements - (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring

The following tables provide the assets and liabilities carried at fair value measured on a recurring basis at December 31, 2018 and December 31, 2017:

	Fair Value Measurements Using
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
December 31, 2018
Assets:
Available-for-sale debt securities:
Municipal notes and bonds	$	62,684	$	—	$	62,684	$	—
Total assets	$	62,684	$	—	$	62,684	$	—
Liabilities:
Contingent consideration - acquisitions	$	2,060	$	—	$	—	$	2,060
Foreign currency forward contracts		32		—		32		—
Total liabilities	$	2,092	$	—	$	32	$	2,060
December 31, 2017
Assets:
Available-for-sale debt securities:
Municipal notes and bonds	$	109,589	$	—	$	109,589	$	—
Foreign currency forward contracts		45		—		45		—
Total assets	$	109,634	$	—	$	109,634	$	—
Liabilities:
Contingent consideration - acquisitions	$	2,593	$	—	$	—	$	2,593
Total liabilities	$	2,593	$	—	$	—	$	2,593

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

This table presents a reconciliation of all liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the year ended December 31, 2018:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Balance at December 31, 2017	$	2,593
Total loss due to remeasurement included in selling, general and    administrative expense		1,010
Additions		—
Payments		(1,543	)
Transfer into (out of) Level 3		—
Balance at December 31, 2018	$	2,060