Accumulated Other Comprehensive Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 12,502,000
Total change in hedge fair value recorded in Other Comprehensive Income	153,000
Amounts reclassified from accumulated other comprehensive income	187,000
Net change related to derivatives	340,000	$ (65,000)	$ (115,000)
Net current-period other comprehensive income (loss)	(7,620,000)
Balance	4,882,000	12,502,000
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	14,966,000
Total change in hedge fair value recorded in Other Comprehensive Income
Amounts reclassified from accumulated other comprehensive income
Net change related to derivatives
Net current-period other comprehensive income (loss)	(8,124,000)
Balance	6,842,000	14,966,000
Net of income tax benefit (expense)	(36,000)
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(12,000)
Total change in hedge fair value recorded in Other Comprehensive Income
Amounts reclassified from accumulated other comprehensive income
Net change related to derivatives
Net current-period other comprehensive income (loss)	(2,000)
Balance	(14,000)	(12,000)
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(2,135,000)
Total change in hedge fair value recorded in Other Comprehensive Income
Amounts reclassified from accumulated other comprehensive income
Net change related to derivatives
Net current-period other comprehensive income (loss)	166,000
Balance	(1,969,000)	(2,135,000)
Net of income tax benefit (expense)	(41,000)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(317,000)
Total change in hedge fair value recorded in Other Comprehensive Income	153,000
Amounts reclassified from accumulated other comprehensive income	187,000
Net change related to derivatives	340,000
Net current-period other comprehensive income (loss)	340,000
Balance	23,000	$ (317,000)
Net of income tax benefit (expense)	$ 66,000