Financial Instruments Measured at Fair Value (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Fair Value Disclosures
Equity Method Investment, Ownership Percentage		8.40%
Debt and Equity Securities, Unrealized Gain (Loss)		$ (7,788)	$ (239)	$ (4,204)
Fair Value, Measurements, Recurring [Member]
Fair Value Disclosures
Cash and Cash Equivalents	[1]	4,812	6,062
Equity investments	[2]	56,985	45,879
Interest Rate Cash Flow Hedge Asset at Fair Value		21,831	20,983
Foreign Currency Contract, Asset, Fair Value Disclosure		40,612	12,760
Total Fair Value Assets And Liabilities Measured On Recurring Basis		124,240	85,684
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Disclosures
Cash and Cash Equivalents	[1]	4,812	6,062
Equity investments	[2]	56,985	45,879
Interest Rate Cash Flow Hedge Asset at Fair Value		0	0
Foreign Currency Contract, Asset, Fair Value Disclosure		0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis		61,797	51,941
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value Disclosures
Cash and Cash Equivalents		0	0
Equity investments		0	0
Interest Rate Cash Flow Hedge Asset at Fair Value		21,831	20,983
Foreign Currency Contract, Asset, Fair Value Disclosure		40,612	12,760
Total Fair Value Assets And Liabilities Measured On Recurring Basis		62,443	33,743
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Disclosures
Cash and Cash Equivalents		0	0
Equity investments		0	0
Interest Rate Cash Flow Hedge Asset at Fair Value		0	0
Foreign Currency Contract, Asset, Fair Value Disclosure		0	0
Total Fair Value Assets And Liabilities Measured On Recurring Basis		$ 0	$ 0

[1] Cash equivalents include highly liquid investments with an original maturity of less than three months.

[2] The company has an 8.4% equity ownership interest in Marubun Corporation and a portfolio of mutual funds with quoted market prices. During 2021, 2020, and 2019 the company recorded unrealized gains (losses) of $7,788, $(239), and $4,204, respectively, on equity securities held at the end of each year.