Fair Value Measurements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset derivatives	$ 0	$ 0
Liability derivatives	0	0
Bank acceptances	0	0
Rabbi trust assets	3,306	3,233
Financial assets and financial liabilities, reported at fair value	3,306	3,233
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset derivatives	441	1,642
Liability derivatives	(3,091)	(1,988)
Bank acceptances	10,509	13,267
Rabbi trust assets	0	0
Financial assets and financial liabilities, reported at fair value	7,859	12,921
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset derivatives	0	0
Liability derivatives	0	0
Bank acceptances	0	0
Rabbi trust assets	0	0
Financial assets and financial liabilities, reported at fair value	0	0
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset derivatives	441	1,642
Liability derivatives	(3,091)	(1,988)
Bank acceptances	10,509	13,267
Rabbi trust assets	3,306	3,233
Financial assets and financial liabilities, reported at fair value	$ 11,165	$ 16,154
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity of bank acceptances	3 months
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity of bank acceptances	6 months