Derivatives (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Apr. 28, 2017 USD ($) Bank	Dec. 31, 2012 USD ($)
Derivative [Line Items]
Net cash payments from settlement	$ (9,158,000)	$ (11,678,000)	$ (21,090,000)
Derivative Assets	2,075,000	2,517,000
Derivative Liabilities	(821,000)	(348,000)
Net sales	1,491,118,000	1,495,889,000	1,436,499,000
Interest expense	$ 20,629,000	16,841,000	14,571,000
Interest rate contracts
Derivative [Line Items]
Contract term (up to)	2 years
Foreign exchange contracts
Derivative [Line Items]
Net cash payments from settlement	$ 7,538,000	10,813,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	700,000	1,412,000
Derivative Liabilities	(820,000)	(258,000)
Designated as Hedging Instrument [Member] | Interest rate contracts
Derivative [Line Items]
Derivative Assets	0	1,412,000
Derivative Liabilities	(820,000)	0
Designated as Hedging Instrument [Member] | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	700,000	0
Derivative Liabilities	0	(258,000)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative	(949,000)	673,000	299,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(609,000)	(1,393,000)	(787,000)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest rate contracts
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative	(1,702,000)	578,000	460,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	347,000	(277,000)	(545,000)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign exchange contracts
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative	753,000	95,000	(161,000)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(956,000)	(1,116,000)	(242,000)
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	1,375,000	1,105,000
Derivative Liabilities	(1,000)	(90,000)
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	1,375,000	1,105,000
Derivative Liabilities	(1,000)	(90,000)
Amount of Gain (Loss) Recognized in Income on Derivatives	$ (8,250,000)	$ (12,162,000)	$ (16,813,000)
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%	1.03%
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | one-month LIBOR [Member]
Derivative [Line Items]
Derivative amount of hedge				$ 100,000,000	$ 100,000,000