Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands		Total		Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balance (in shares) at Dec. 31, 2018	[1]			11,620
Beginning balance at Dec. 31, 2018	[1]	$ 515,360		$ 1,166	$ 108,422	$ (426)	$ 451,029	$ (44,831)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	[1]	67,096					63,103	3,993
Stock-based compensation expense	[1]	3,269			3,269
Stock-based compensation transactions (in shares)	[1]			90
Stock-based compensation transactions	[1]	1,984		$ 9	1,975
Repurchased shares (in shares)	[1]			(40)
Repurchased shares	[1]	(4,140)				(4,140)
Dividends paid	[1]	(5,626)					(5,626)
Ending balance (in shares) at Dec. 31, 2019	[1]			11,670
Ending balance at Dec. 31, 2019	[1]	577,943		$ 1,175	113,666	(4,566)	508,506	(40,838)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income	[1]	58,316					57,804	512
Stock-based compensation expense	[1]	4,119			4,119
Stock-based compensation transactions (in shares)	[1]			57
Stock-based compensation transactions	[1]	749		$ 6	743
Repurchased shares (in shares)	[1]			0
Repurchased shares	[1]	0				0
Dividends paid	[1]	(6,124)					(6,124)
Ending balance (in shares) at Dec. 31, 2020	[1]			11,727
Ending balance at Dec. 31, 2020	[1]	635,003	[2]	$ 1,181	118,528	(4,566)	560,186	(40,326)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income		71,581					80,245	(8,664)
Stock-based compensation expense		5,987			5,987
Stock-based compensation transactions (in shares)				64
Stock-based compensation transactions		(281)		$ 6	(287)
Dividends paid		(6,627)					(6,627)
Ending balance (in shares) at Dec. 31, 2021				11,791
Ending balance at Dec. 31, 2021		$ 705,663		$ 1,187	$ 124,228	$ (4,566)	$ 633,804	$ (48,990)

[1] Years ended December 31, 2020 and 2019 amounts have been adjusted to reflect the change in inventory accounting method, as described in Note 1 to the Consolidated Financial Statements. 

[2] Years ended December 31, 2020 amounts have been adjusted to reflect the change in inventory accounting method, as described in Note 1 to the Consolidated Financial Statements.