Consolidated Statement of Shareholders' Equity - USD ($)	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance (in shares) at Dec. 31, 2019		30,058,455
Beginning Balance at Dec. 31, 2019	$ 823,202,000	$ 30,058,000	$ 228,153,000	$ 820,666,000	$ (150,893,000)	$ (104,782,000)
Beginning Balance (in shares) at Dec. 31, 2019						2,219,332
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings	(69,742,000)	0	0	(69,742,000)	0	$ 0
Other comprehensive income	$ 20,072,000	0	0	0	20,072,000	0
Common Stock, Dividends, Per Share, Declared	$ 0.80
Dividends (per share of common stock, $0.80)	$ (22,160,000)	$ 0	$ 0	$ (22,160,000)	$ 0	$ 0
Purchase of treasury shares (in shares)		0	0	0	0	302,778
Purchase of treasury shares	(14,209,000)	$ 0				$ (14,209,000)
Employee stock plans (in shares)		164,149
Employee stock plans	4,296,000	$ 164,000	$ 5,752,000	$ 0	$ 0
Employee stock plans (in shares)						32,150
Employee stock plans						$ (1,620,000)
Share-based compensation expense (in shares)		56,064
Share-based compensation expense	4,979,000	$ 57,000	4,924,000	0	0
Share-based compensation expense (in shares)						1,525
Share-based compensation expense						$ (2,000)
Ending Balance (in shares) at Dec. 31, 2020		30,278,668
Ending Balance at Dec. 31, 2020	746,438,000	$ 30,279,000	238,829,000	728,764,000	(130,821,000)	$ (120,613,000)
Ending Balance (in shares) at Dec. 31, 2020						2,555,785
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings	43,676,000	0	0	43,676,000	0	$ 0
Income Tax Effects Allocated Directly to Equity, Cumulative Effect of Change in Accounting Principle	(274,000)	0	0	(274,000)	0	0
Other comprehensive income	$ 19,436,000	0	0	0	19,436,000	0
Common Stock, Dividends, Per Share, Declared	$ 0.80
Dividends (per share of common stock, $0.80)	$ (22,269,000)	$ 0	0	(22,269,000)	0	$ 0
Purchase of treasury shares (in shares)		0				12,992
Purchase of treasury shares	(618,000)	$ 0	0	0	0	$ (618,000)
Employee stock plans (in shares)		71,945
Employee stock plans	2,705,000	$ 72,000	2,716,000	0	0
Employee stock plans (in shares)						(1,416)
Employee stock plans						$ (83,000)
Share-based compensation expense (in shares)		83,656
Share-based compensation expense	6,687,000	$ 83,000	6,608,000	0	0
Share-based compensation expense (in shares)						3,703
Share-based compensation expense						$ (4,000)
Ending Balance (in shares) at Dec. 31, 2021		30,434,269
Ending Balance at Dec. 31, 2021	$ 796,329,000	$ 30,434,000	248,153,000	750,445,000	(111,385,000)	$ (121,318,000)
Ending Balance (in shares) at Dec. 31, 2021	2,573,896					2,573,896
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) earnings	$ (46,226,000)	0	0		0	$ 0
Other comprehensive income	$ (47,036,000)	0	0	0	(47,036,000)	0
Common Stock, Dividends, Per Share, Declared	$ 0.80
Dividends (per share of common stock, $0.80)	$ (22,397,000)	0	0	(22,397,000)	0	0
Impact of change in debt accounting standard	(5,854,000)	$ 0	(12,489,000)	6,635,000	0	$ 0
Purchase of treasury shares (in shares)		0				19,651
Purchase of treasury shares	(801,000)	$ 0	0	0	0	$ (801,000)
Employee stock plans (in shares)		71,795
Employee stock plans	2,143,000	$ 72,000	2,071,000	0	0
Employee stock plans (in shares)						0
Employee stock plans						$ 0
Share-based compensation expense (in shares)		134,004
Share-based compensation expense	7,821,000	$ 134,000	7,701,000	0	0
Share-based compensation expense (in shares)						14,294
Share-based compensation expense						$ (14,000)
Ending Balance (in shares) at Dec. 31, 2022		30,640,068
Ending Balance at Dec. 31, 2022	$ 683,979,000	$ 30,640,000	$ 245,436,000	$ 688,457,000	$ (158,421,000)	$ (122,133,000)
Ending Balance (in shares) at Dec. 31, 2022	2,607,841					2,607,841