Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Maturity of bank acceptances	1 year
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	3,434	3,233
Financial assets and financial liabilities, reported at fair value	3,434	3,233
Significant Other Observable Inputs (Level 2)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset derivatives	484	1,642
Liability derivatives	(2,565)	(1,988)
Bank acceptances	9,033	13,267
Rabbi trust assets	0	0
Financial assets and financial liabilities, reported at fair value	6,952	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
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Asset derivatives	484	1,642
Liability derivatives	(2,565)	(1,988)
Bank acceptances	9,033	13,267
Rabbi trust assets	3,434	3,233
Financial assets and financial liabilities, reported at fair value	$ 10,386	$ 16,154