Fair Value Measurements - (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Measurements [Abstract]

Fair Value, Measurement Inputs, Disclosure [Table Text Block]

The following tables provide the assets and liabilities carried at fair value measured on a recurring basis at June 30, 2017 and December 31, 2016:

			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)
June 30, 2017
Assets:
Available-for-sale debt securities:
Municipal notes and bonds	$	90,403	$	—	$	90,403	$	—
Corporate bonds	841		—		841		—
Foreign currency forward contracts	94		—		94		—
Total Assets	$	91,338	$	—	$	91,338	$	—
Liabilities:
Contingent consideration - acquisitions	3,025		—		—		3,025
Total Liabilities	$	3,025	$	—	$	—	$	3,025
December 31, 2016
Assets:
Available-for-sale debt securities:
Municipal notes and bonds	$	87,029	$	—	$	87,029	$	—
Corporate bonds	843		—		843		—
Foreign currency forward contracts	312		—		312		—
Total Assets	$	88,184	$	—	$	88,184	$	—
Liabilities:
Contingent consideration - acquisitions	3,251		—		—		3,251
Total Liabilities	$	3,251	$	—	$	—	$	3,251

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

This table presents a reconciliation for all liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the six months ended June 30, 2017:

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Balance at December 31, 2016	$	3,251
Additions	—
Total loss included in selling, general and administrative expense	132
Payments	(358		)
Transfers into (out of) Level 3	—
Balance at June 30, 2017	$	3,025