Derivatives (Details)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Apr. 28, 2017 USD ($) Bank
Derivative [Line Items]
Net cash payments from settlement	$ 3,837,000	$ (9,158,000)	$ (11,678,000)
Derivative Assets	1,642,000	2,075,000
Derivative Liabilities	(1,988,000)	(821,000)
Net sales	1,124,391,000	1,491,118,000	1,495,889,000
Interest expense	$ 15,944,000	20,629,000	16,841,000
Interest Rate Contract [Member]
Derivative [Line Items]
Contract term (up to)	2 years
Foreign Exchange Contract [Member]
Derivative [Line Items]
Net cash payments from settlement	$ (5,587,000)	7,538,000	10,813,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	908,000	700,000
Derivative Liabilities	(1,977,000)	(820,000)
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Derivative Assets	0	0
Derivative Liabilities	(1,977,000)	(820,000)
Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	908,000	700,000
Derivative Liabilities	0	0
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	(642,000)	(949,000)	673,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(1,332,000)	(609,000)	(1,393,000)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Interest Rate Contract [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative	(882,000)	(1,702,000)	578,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(1,321,000)	347,000	(277,000)
Designated as Hedging Instrument [Member] | Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Income (Loss) on Derivative	240,000	753,000	95,000
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income	(11,000)	(956,000)	(1,116,000)
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative Assets	734,000	1,375,000
Derivative Liabilities	(11,000)	(1,000)
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Derivative Assets	734,000	1,375,000
Derivative Liabilities	(11,000)	(1,000)
Amount of Gain (Loss) Recognized in Income on Derivatives	$ 5,631,000	$ (8,250,000)	$ (12,162,000)
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%
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