Consolidated Statements of Comprehensive Income Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax	$ (74)	$ 34	$ (2,817)	$ (537)	$ (40)	$ (3,339)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	15,203	(7,263)	(4,104)	(2,969)	7,940	(7,073)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(4,226)	2,076	6,631		(2,150)	9,433
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	986	(31)	(24)	4	955	(20)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	(212)	97	(10,071)	(1,869)	(115)	(11,940)
Payments of Stock Issuance Costs		8,340
Stock Issued During Period, Value, Stock Options Exercised	1,122	290	243	183
Stock based compensation	2,762	2,262	1,649	2,071	5,504	3,989
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	147	$ 1,765	54	$ 926
Stock Issued During Period, Value, Stock Dividend	$ (1,706)		$ (1,433)
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	32,665	58,081	35,023	68,369
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	38,744	12,682	12,220	11,236			125,150
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	$ (2,995)	$ 96	$ 82	$ (13)	$ (2,899)	$ 69
Director
Stock based compensation	480
Retained Earnings
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	15,203	(7,263)	(4,104)	(2,969)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	0	0	0	0
Stock Issued During Period, Value, Stock Options Exercised	0	0	0	0
Stock based compensation	0	0	0	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	0	0	0
Stock Issued During Period, Value, Stock Dividend	(1,706)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	0	0	0	0
Retained Earnings | Director
Stock based compensation	0
AOCI Attributable to Parent
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	0	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(4,226)	2,076
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	(212)	97	(10,071)	(1,869)
Stock Issued During Period, Value, Stock Options Exercised	0	0	0	0
Stock based compensation	0	0	0	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	0	0	0
Stock Issued During Period, Value, Stock Dividend	0		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	(2,995)	96	82	(13)
AOCI Attributable to Parent | Director
Stock based compensation	0
Common Stock [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	0	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	0	0	0	0
Stock Issued During Period, Value, Stock Options Exercised	0	0		0
Stock based compensation	0	0	0	0
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	0	(1)	0	1
Stock Issued During Period, Value, Stock Dividend	0		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	0	0	0	0
Common Stock [Member] | Director
Stock based compensation	0
Additional Paid-in Capital [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	0	0	0	0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	0	0	0
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent	0	0	0	0
Stock Issued During Period, Value, Stock Options Exercised	1,122	290	243	183
Stock based compensation	2,762	2,262	1,649	2,071
Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures	147	1,766	54	927
Stock Issued During Period, Value, Stock Dividend	0		0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax	0	$ 0	$ 0	$ 0
Additional Paid-in Capital [Member] | Director
Stock based compensation	$ 480