Consolidated Statement of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning balance (in shares) at Dec. 31, 2020		33,568
Balance, value at Dec. 31, 2020	$ 743,805	$ 336	$ 304,870	$ 469,943	$ (2,461)	$ (28,883)
Beginning balance (in shares) at Dec. 31, 2020						(1,028)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	12,762			12,762
Foreign currency translation adjustment	3,198				3,198
Minimum post retirement benefit plan adjustments, net of taxes	27				27
Stock compensation expense	2,368		2,368
Stock options exercised, shares		25
Stock options exercised	910		910
Net settlement of restricted stock units, shares		118				54
Net settlement of restricted stock units	(4,662)	$ 1	(1)			$ (4,662)
Ending balance (in shares) at Mar. 31, 2021		33,711
Balance, value at Mar. 31, 2021	758,408	$ 337	308,147	482,705	764	$ (33,545)
Ending balance (in shares) at Mar. 31, 2021						(1,082)
Beginning balance (in shares) at Dec. 31, 2020		33,568
Balance, value at Dec. 31, 2020	743,805	$ 336	304,870	469,943	(2,461)	$ (28,883)
Beginning balance (in shares) at Dec. 31, 2020						(1,028)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	38,711
Foreign currency translation adjustment	3,959
Ending balance (in shares) at Jun. 30, 2021		33,718
Balance, value at Jun. 30, 2021	787,608	$ 337	310,728	508,654	1,552	$ (33,663)
Ending balance (in shares) at Jun. 30, 2021						(1,083)
Beginning balance (in shares) at Mar. 31, 2021		33,711
Balance, value at Mar. 31, 2021	758,408	$ 337	308,147	482,705	764	$ (33,545)
Beginning balance (in shares) at Mar. 31, 2021						(1,082)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,949			25,949
Foreign currency translation adjustment	761				761
Minimum post retirement benefit plan adjustments, net of taxes	27				27
Stock compensation expense	2,567		2,567
Stock options exercised, shares		1
Stock options exercised	14		14
Awards of common shares (in shares)		3
Net settlement of restricted stock units, shares		3				1
Net settlement of restricted stock units	(118)	$ 0	0			$ (118)
Ending balance (in shares) at Jun. 30, 2021		33,718
Balance, value at Jun. 30, 2021	$ 787,608	$ 337	310,728	508,654	1,552	$ (33,663)
Ending balance (in shares) at Jun. 30, 2021						(1,083)
Beginning balance (in shares) at Dec. 31, 2021	33,799	33,799
Balance, value at Dec. 31, 2021	$ 825,258	$ 338	314,541	545,572	187	$ (35,380)
Beginning balance (in shares) at Dec. 31, 2021						1,107
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	15,456			15,456
Foreign currency translation adjustment	(227)				(227)
Minimum post retirement benefit plan adjustments, net of taxes	24				24
Stock compensation expense	1,352		1,352
Net settlement of restricted stock units, shares		173				72
Net settlement of restricted stock units	(3,461)	$ 2	(2)			$ (3,461)
Ending balance (in shares) at Mar. 31, 2022		33,972
Balance, value at Mar. 31, 2022	$ 838,402	$ 340	315,891	561,028	(16)	$ (38,841)
Ending balance (in shares) at Mar. 31, 2022						1,179
Beginning balance (in shares) at Dec. 31, 2021	33,799	33,799
Balance, value at Dec. 31, 2021	$ 825,258	$ 338	314,541	545,572	187	$ (35,380)
Beginning balance (in shares) at Dec. 31, 2021						1,107
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	44,763
Foreign currency translation adjustment	$ (3,425)
Ending balance (in shares) at Jun. 30, 2022	33,799	33,989
Balance, value at Jun. 30, 2022	$ 817,278	$ 340	318,664	590,335	(3,213)	$ (88,848)
Ending balance (in shares) at Jun. 30, 2022						2,374
Beginning balance (in shares) at Mar. 31, 2022		33,972
Balance, value at Mar. 31, 2022	838,402	$ 340	315,891	561,028	(16)	$ (38,841)
Beginning balance (in shares) at Mar. 31, 2022						1,179
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	29,307			29,307
Foreign currency translation adjustment	(3,198)				(3,198)
Minimum post retirement benefit plan adjustments, net of taxes	1				1
Stock compensation expense	2,773		2,773
Awards of common shares (in shares)		16
Net settlement of restricted stock units, shares		1				0
Net settlement of restricted stock units	(7)	$ 0	0			$ (7)
Common stock repurchased (in shares)						1,195
Common stock repurchased under stock repurchase program	$ (50,000)					$ (50,000)
Ending balance (in shares) at Jun. 30, 2022	33,799	33,989
Balance, value at Jun. 30, 2022	$ 817,278	$ 340	$ 318,664	$ 590,335	$ (3,213)	$ (88,848)
Ending balance (in shares) at Jun. 30, 2022						2,374