Consolidated Statements Of Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings	Trust for Savings Restoration Plan	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Dec. 31, 2019	$ 376,749	$ 45,514	$ 530,478	$ (1,592)	$ (197,651)
Beginning balance (in shares) at Dec. 31, 2019		33,365,039
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(75,444)		(75,444)
Foreign currency translation adjustment	(8,781)				(8,781)
Reclassification of foreign currency translation loss realized on the sale of Personal Care Films	(25,295)				(25,295)
Derivative financial instruments adjustment	3,571				3,571
Net gains or (losses) and prior service costs	(12,197)				(12,197)
Amortization of prior service costs and net gains or losses	11,359				11,359
Cash dividends declared	(216,049)		(216,049)
Stock-based compensation expense (in shares)		131,354
Stock-based compensation expense	5,402	$ 5,402
Repurchase of employee common stock for tax withholdings	$ (850)	$ (850)
Repurchase of employee common stock for tax withholdings (in shares)	141,074	(39,217)
Tredegar common stock purchased by trust for savings restoration plan	$ 0		495	(495)
Ending balance at Dec. 31, 2020	109,055	$ 50,066	239,480	(2,087)	(178,404)
Ending balance (in shares) at Dec. 31, 2020		33,457,176
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	57,826		57,826
Foreign currency translation adjustment	(1,643)				(1,643)
Reclassification of foreign currency translation loss realized on the sale of Personal Care Films	0
Derivative financial instruments adjustment	(1,363)				(1,363)
Net gains or (losses) and prior service costs	18,720				18,720
Amortization of prior service costs and net gains or losses	13,186				13,186
Cash dividends declared	(16,167)		(16,167)
Stock-based compensation expense (in shares)		229,014
Stock-based compensation expense	4,783	$ 4,783
Repurchase of employee common stock for tax withholdings	$ (590)	$ (590)
Repurchase of employee common stock for tax withholdings (in shares)	67,705	(17,266)
Issued upon exercise of stock options	$ 915	$ 915
Issued upon exercise of stock options (in shares)		67,705
Tredegar common stock purchased by trust for savings restoration plan	0		48	(48)
Ending balance at Dec. 31, 2021	184,722	$ 55,174	281,187	(2,135)	(149,504)
Ending balance (in shares) at Dec. 31, 2021		33,736,629
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	28,455		28,455
Foreign currency translation adjustment	(287)				(287)
Reclassification of foreign currency translation loss realized on the sale of Personal Care Films	0
Derivative financial instruments adjustment	(3,381)				(3,381)
Net gains or (losses) and prior service costs	(5,064)				(5,064)
Amortization of prior service costs and net gains or losses	10,641				10,641
Cash dividends declared	(16,974)		(16,974)
Stock-based compensation expense (in shares)		294,764
Stock-based compensation expense	4,046	$ 4,046
Repurchase of employee common stock for tax withholdings	(396)	$ (396)
Repurchase of employee common stock for tax withholdings (in shares)		(30,751)
Tredegar common stock purchased by trust for savings restoration plan	0		53	(53)
Ending balance at Dec. 31, 2022	$ 201,762	$ 58,824	$ 292,721	$ (2,188)	$ (147,595)
Ending balance (in shares) at Dec. 31, 2022		34,000,642