Condensed Consolidated Statements of Equity (USD $) In Thousands	Total	Common Shares in Treasury	Common Stock	Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non-controlling Interests
Beginning balance at Dec. 31, 2009	$ 560,495	$ (171,567)	$ 93,436	$ 331,376	$ 357,128	$ (60,147)	$ 10,269
Beginning balance, shares at Dec. 31, 2009		7,375
Net income	4,420				3,687		733
Other comprehensive income (loss), net of tax:
Foreign currency translation	(1,218)					(1,319)	101
Postretirement benefit liabilities	(4,167)					(4,167)
Raw material commodity swaps	(107)					(107)
Interest rate swaps	6,121					6,121
Total comprehensive income	5,049
Cash dividends:
Preferred	(495)				(495)
Income tax benefit	11			11
Redemption of Convertible Notes	(3,025)			(3,025)
Stock-based compensation transactions, shares		(122)
Stock-based compensation transactions	2,876	4,905		(2,029)
Distributions to noncontrolling interests	(527)						(527)
Ending Balance at Sep. 30, 2010	564,384	(166,662)	93,436	326,333	360,320	(59,619)	10,576
Ending balance, shares at Sep. 30, 2010		7,253
Beginning balance at Dec. 31, 2010	574,180	(164,257)	93,436	323,015	362,164	(50,949)	10,771
Beginning balance, shares at Dec. 31, 2010		7,242
Net income	61,034				60,461		573
Other comprehensive income (loss), net of tax:
Foreign currency translation	(562)					(751)	189
Postretirement benefit liabilities	4,676					4,676
Total comprehensive income	65,148
Cash dividends:
Preferred	(165)				(165)
Stock-based compensation transactions, shares		(377)
Stock-based compensation transactions	6,274	10,683		(4,409)
Distributions to noncontrolling interests	(938)						(938)
Ending Balance at Sep. 30, 2011	$ 644,499	$ (153,574)	$ 93,436	$ 318,606	$ 422,460	$ (47,024)	$ 10,595
Ending balance, shares at Sep. 30, 2011		6,865