Inventory (Details) (USD $)	Dec. 31, 2011		Dec. 31, 2010
Inventory, Net [Abstract]
Finished goods	$ 96,261,000	[1]	$ 84,013,000	[1]
Work in progress	5,544,000		6,041,000
Raw materials	18,295,000		17,517,000
Manufacturing and maintenance supplies	1,898,000		2,464,000
Total inventory	121,998,000		110,035,000
Inventory, Real Estate, Held for Development and Sale [Abstract]
Inventory, Real Estate, Held-for-sale	$ 8,300,000		$ 2,900,000

[1] Includes $8.3 million and $2.9 million of HBU real estate held for sale at December 31, 2011 and 2010, respectively.