Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Balance, shares at Dec. 31, 2020		33,568,000				1,028,000
Balance at Dec. 31, 2020	$ 743,805	$ 336	$ 304,870	$ 469,943	$ (2,461)	$ (28,883)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	75,629			75,629
Foreign currency translation adjustment	2,512				2,512
Adjustment to post-retirement healthcare benefit liability, net of taxes	136				136
Stock compensation expense	8,652		8,652
Net settlement of restricted stock units, shares		192,000				79,000
Net settlement of restricted stock units	$ (6,497)	$ 2	(2)			$ (6,497)
Issuance of restricted stock, shares		3,000
Stock options exercised, shares	36,500	36,000
Common stock repurchased under stock repurchase program	$ 1,021		1,021
Balance, shares at Dec. 31, 2021		33,799,000				1,107,000
Balance at Dec. 31, 2021	825,258	$ 338	314,541	545,572	187	$ (35,380)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Minimum pension and post retirement benefit plan adjustments, net of taxes	(43)
Net income	82,406			82,406
Foreign currency translation adjustment	(5,022)				(5,022)
Adjustment to post-retirement healthcare benefit liability, net of taxes	1,403				1,403
Stock compensation expense	8,334		8,334
Net settlement of restricted stock units, shares		245,000				95,000
Net settlement of restricted stock units	(4,404)	$ 2	(2)			$ (4,404)
Issuance of restricted stock, shares		16,000
Common stock repurchased under stock repurchase program (in shares)						1,997,000
Common stock repurchased under stock repurchase program	(85,876)					$ (85,876)
Balance, shares at Dec. 31, 2022		34,060,000				3,199,000
Balance at Dec. 31, 2022	822,099	$ 340	322,873	627,978	(3,432)	$ (125,660)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Minimum pension and post retirement benefit plan adjustments, net of taxes	(449)
Net income	110,533			110,533
Foreign currency translation adjustment	1,204				1,204
Adjustment to post-retirement healthcare benefit liability, net of taxes	114				114
Stock compensation expense	9,750		9,750
Net settlement of restricted stock units, shares		151,000				58,000
Net settlement of restricted stock units	(3,362)	$ 2	(2)			$ (3,362)
Issuance of restricted stock, shares		8,000
Common stock repurchased under stock repurchase program (in shares)						521,000
Common stock repurchased under stock repurchase program	$ (25,181)					$ (25,181)
Stock options exercised, shares	0
Excise tax on repurchase of common shares	$ (159)					$ (159)
Balance, shares at Dec. 31, 2023		34,219,000				3,778,000
Balance at Dec. 31, 2023	914,998	$ 342	$ 332,621	$ 738,511	$ (2,114)	$ (154,362)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Minimum pension and post retirement benefit plan adjustments, net of taxes	$ (36)