Condensed Consolidated Statement of Shareholders' Equity Statement - USD ($)	Total	Common Stock [Member]	Common Stock [Member] Class B Common Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Treasury Stock [Member]
Total Shareholders’ Equity at Dec. 31, 2020	$ 333,846,000	$ 9,816,000	$ 2,000	$ 326,088,000	$ 58,538,000	$ 45,436,000	$ (106,034,000)
Purchases of capped calls	(18,787,000)
Total Shareholders’ Equity at Jun. 30, 2021	280,890,000	9,977,000	2,000	278,152,000	43,466,000	57,079,000	(107,786,000)
Total Shareholders’ Equity at Dec. 31, 2020	333,846,000	9,816,000	2,000	326,088,000	58,538,000	45,436,000	(106,034,000)
Allocated Share-based Compensation Expense	131,000	52,000		747,000			(668,000)
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	3,486,000	109,000		4,461,000			(1,084,000)
Net Loss	(47,501,000)				(47,501,000)
Foreign currency translation adjustments	(6,487,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(6,487,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	576,000					576,000
Amortization of prior service costs and unrecognized losses	(422,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax	(422,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(53,834,000)
Adoption of ASU 2020-06	(25,128,000)			(34,798,000)	9,670,000
Purchases of capped calls	(18,787,000)			(18,787,000)
Total Shareholders’ Equity at Sep. 30, 2021	239,714,000	9,977,000	2,000	277,711,000	20,707,000	39,103,000	(107,786,000)
Total Shareholders’ Equity at Jun. 30, 2021	280,890,000	9,977,000	2,000	278,152,000	43,466,000	57,079,000	(107,786,000)
Allocated Share-based Compensation Expense	(1,250,000)	0		(1,250,000)			0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	809,000	0		809,000			0
Net Loss	(22,759,000)				(22,759,000)
Foreign currency translation adjustments	(19,202,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(19,202,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	1,253,000					1,253,000
Amortization of prior service costs and unrecognized losses	(27,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax	(27,000)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(40,735,000)
Total Shareholders’ Equity at Sep. 30, 2021	239,714,000	9,977,000	2,000	277,711,000	20,707,000	39,103,000	(107,786,000)
Total Shareholders’ Equity at Dec. 31, 2021	218,489,000	9,977,000	2,000	276,665,000	22,645,000	16,988,000	(107,788,000)
Allocated Share-based Compensation Expense	(814,000)	0		(814,000)			0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	2,502,000	155,000		2,498,000			(151,000)
Net Loss	(80,494,000)				(80,494,000)
Foreign currency translation adjustments	(66,938,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(66,938,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	236,000					236,000
Amortization of prior service costs and unrecognized losses	4,608,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax	4,608,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(142,588,000)
Stock Issued During Period, Value, New Issues	3,456,000	675,000		2,781,000
Purchases of capped calls	0
Total Shareholders’ Equity at Sep. 30, 2022	81,045,000	10,807,000	2,000	281,130,000	(57,849,000)	(45,106,000)	(107,939,000)
Total Shareholders’ Equity at Jun. 30, 2022	147,604,000	10,132,000	2,000	278,788,000	(23,495,000)	(9,884,000)	(107,939,000)
Allocated Share-based Compensation Expense	(495,000)	0		(495,000)			0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	56,000	0		56,000			0
Net Loss	(34,354,000)				(34,354,000)
Foreign currency translation adjustments	(34,051,000)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(34,051,000)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(1,216,000)					(1,216,000)
Amortization of prior service costs and unrecognized losses	45,000
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	(69,576,000)
Stock Issued During Period, Value, New Issues	3,456,000	675,000		2,781,000
Total Shareholders’ Equity at Sep. 30, 2022	$ 81,045,000	$ 10,807,000	$ 2,000	$ 281,130,000	$ (57,849,000)	$ (45,106,000)	$ (107,939,000)