Accumulated Other Comprehensive Income (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 63,279,000	$ 105,060,000	$ 81,173,000
Net change related to derivatives	(580,000)	557,000	340,000
Net current-period other comprehensive income (loss)	(717,000)	(6,843,000)	(7,619,000)
Balance	32,996,000	63,279,000	105,060,000
Foreign Currency Items [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(697,000)
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)	(289,000)
Net of income tax expense (benefit)	(8,000)
Balance	(986,000)	(697,000)
Unrealized Gain (Losses) On Available-For-Sale Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(18,000)
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)
Balance	(18,000)	(18,000)
Accrued Pension Service Costs [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,822,000)
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)	153,000
Net of income tax expense (benefit)	54,000
Balance	(1,669,000)	(1,822,000)
Hedge Accounting Reserve [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	580,000
Total change in hedge fair value recorded in Other Comprehensive Income	(1,000)
Amounts reclassified from accumulated other comprehensive income	(579,000)
Net change related to derivatives	(580,000)
Net current-period other comprehensive income (loss)	(580,000)
Balance		580,000
Accumulated Other Comprehensive Income/(Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(1,957,000)	4,882,000	12,502,000
Total change in hedge fair value recorded in Other Comprehensive Income	(1,000)
Amounts reclassified from accumulated other comprehensive income	(579,000)
Net change related to derivatives	(580,000)
Net current-period other comprehensive income (loss)	(716,000)	(6,839,000)	(7,620,000)
Balance	$ (2,673,000)	$ (1,957,000)	$ 4,882,000