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, 2021	$ 184,722	$ 55,174	$ 281,187	$ (2,135)	$ (149,504)
Net income (loss)	31,292
Foreign currency translation adjustment	306				306
Derivative financial instruments adjustment	(3,231)				(3,231)
Amortization of prior service costs and net gains or losses	5,094				5,094
Cash dividends declared ($0.26 per share)	(8,135)		(8,135)
Stock-based compensation expense	2,133	2,133
Repurchase of employee common stock for tax withholdings	(396)	(396)
Tredegar common stock purchased by trust for savings restoration plan			26	(26)
Ending Balance at Jun. 30, 2022	$ 211,785	56,911	304,370	(2,161)	(147,335)
Cash dividends declared, per share	$ 0.24
Beginning Balance at Mar. 31, 2022	$ 211,868	55,953	293,563	(2,148)	(135,500)
Net income (loss)	14,869
Foreign currency translation adjustment	(5,230)				(5,230)
Derivative financial instruments adjustment	(9,161)				(9,161)
Amortization of prior service costs and net gains or losses	2,556				2,556
Cash dividends declared ($0.26 per share)	(4,075)		(4,075)
Stock-based compensation expense	958	958
Tredegar common stock purchased by trust for savings restoration plan			13	(13)
Ending Balance at Jun. 30, 2022	$ 211,785	56,911	304,370	(2,161)	(147,335)
Cash dividends declared, per share	$ 0.12
Beginning Balance at Dec. 31, 2022	$ 201,762	58,824	292,721	(2,188)	(147,595)
Net income (loss)	(19,934)		(19,934)
Foreign currency translation adjustment	2,741				2,741
Derivative financial instruments adjustment	1,637				1,637
Amortization of prior service costs and net gains or losses	4,573				4,573
Cash dividends declared ($0.26 per share)	(8,884)		(8,884)
Stock-based compensation expense	1,508	1,508
Repurchase of employee common stock for tax withholdings	(254)	(254)
Tredegar common stock purchased by trust for savings restoration plan			30	(30)
Ending Balance at Jun. 30, 2023	$ 183,149	60,078	263,933	(2,218)	(138,644)
Cash dividends declared, per share	$ 0.26
Beginning Balance at Mar. 31, 2023	$ 201,609	59,423	287,308	(2,203)	(142,919)
Net income (loss)	(18,922)		(18,922)
Foreign currency translation adjustment	1,621				1,621
Derivative financial instruments adjustment	368				368
Amortization of prior service costs and net gains or losses	2,286				2,286
Cash dividends declared ($0.26 per share)	(4,468)		(4,468)
Stock-based compensation expense	655	655
Tredegar common stock purchased by trust for savings restoration plan			15	(15)
Ending Balance at Jun. 30, 2023	$ 183,149	$ 60,078	$ 263,933	$ (2,218)	$ (138,644)
Cash dividends declared, per share	$ 0.13