Derivatives (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Apr. 28, 2017 USD ($) Bank
Derivative [Line Items]
Net cash payments from settlement			$ (13,034)	$ (3,598)
Maximum remaining maturity of foreign currency derivatives			2 years
Derivative Assets	$ 25		$ 25		$ 2,517
Derivative Liabilities	(1,640)		(1,640)		(348)
Net sales	372,587	$ 369,797	1,120,947	1,111,772
Interest expense	5,344	4,054	15,856	12,078
Foreign Exchange Contract [Member]
Derivative [Line Items]
Net cash payments from settlement			12,593	3,291
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	0		0		1,412
Derivative Liabilities	(1,413)		(1,413)		(258)
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	0		0		1,412
Derivative Liabilities	(1,011)		(1,011)		0
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	0		0		0
Derivative Liabilities	(402)		(402)		(258)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive (Loss) Income on Derivative	(168)	1,075	(1,960)	1,886
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(113)	(286)	(421)	(1,233)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive (Loss) Income on Derivative	(178)	378	(1,846)	2,064
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	86	40	367	(374)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Amount of (Loss) Gain Recognized in Accumulated Other Comprehensive (Loss) Income on Derivative	10	697	(114)	(178)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(199)	(326)	(788)	(859)
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	25		25		1,105
Derivative Liabilities	(227)		(227)		(90)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	25		25		1,105
Derivative Liabilities	(227)		(227)		$ (90)
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (11,662)	$ 1,380	$ (15,182)	$ (6,218)
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Number of banks transacted with for interest rate swap agreements (in banks) | Bank						1
Fixed interest rate						1.92%
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | one-month LIBOR [Member]
Derivative [Line Items]
Derivative amount of hedge						$ 100,000