Financial Instruments Measured at Fair Value (Tables)

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

The following table presents assets (liabilities) measured at fair value on a recurring basis at December 31, 2016:

	Balance Sheet Location	Level 1		Level 2			Level 3			Total
Cash and cash equivalents	Other assets	$	2,660	$	—		$	—		$	2,660
Available-for-sale securities	Other assets	37,915		—			—			37,915
Interest rate swaps	Other assets	—		152			—			152
Foreign exchange contracts	Other current assets	—		4,685			—			4,685
Foreign exchange contracts	Accrued expenses	—		(3,444		)	—			(3,444		)
Contingent consideration	Accrued expenses	—		—			(4,027		)	(4,027		)
		$	40,575	$	1,393		$	(4,027	)	$	37,941

The following table presents assets (liabilities) measured at fair value on a recurring basis at December 31, 2015:

	Balance Sheet Location	Level 1		Level 2			Level 3			Total
Cash and cash equivalents	Other assets	$	1,559	$	—		$	—		$	1,559
Available-for-sale securities	Other assets	41,178		—			—			41,178
Interest rate swaps	Other assets	—		711			—			711
Foreign exchange contracts	Other current assets	—		2,625			—			2,625
Foreign exchange contracts	Accrued expenses	—		(3,363		)	—			(3,363		)
Contingent consideration	Accrued expenses	—		—			(3,889		)	(3,889		)
		$	42,737	$	(27	)	$	(3,889	)	$	38,821

Description of Types of Interest Rate Fair Value Hedging Instruments Used

The terms of our outstanding interest rate swap contracts at December 31, 2016 are as follows:

Maturity Date	Notional Amount	Interest rate due from counterparty	Interest rate due to counterparty
April 2020	50,000	6.000%	6 mo. USD LIBOR + 3.896
June 2018	50,000	6.875%	6 mo. USD LIBOR + 5.301

Available-for-sale Securities [Text Block]

The fair value of the company's available-for-sale securities is as follows at December 31:

	2016				2015
	Marubun		Mutual Funds		Marubun		Mutual Funds
Cost basis	$	10,016	$	18,097	$	10,016	$	17,389
Unrealized holdinggain	3,806		5,996		8,708		5,065
Fair value	$	13,822	$	24,093	$	18,724	$	22,454

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block]

The effect of derivative instruments on the company's consolidated statements of operations and other comprehensive income are as follows for the years ended December 31 are as follows:

	2016			2015			2014
Gain (Loss) Recognized in Income
Foreign exchange contracts	$	1,535		$	4,755		$	(1,195	)
Interest rate swaps	$	(608	)	$	(523	)	$	(656	)
Total	$	927		$	4,232		$	(1,851	)
Gain (Loss) Recognized in Other Comprehensive Income before reclassifications
Foreign exchange contracts	$	(153	)	$	(1,001	)	$	412
Interest rate swaps	$	—		$	827		$	—