Inventory (Details) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Inventory, Net [Abstract]
Finished goods	$ 103,568,000	[1]	$ 96,261,000	[1]
Work in progress	4,446,000		5,544,000
Raw materials	17,602,000		18,295,000
Manufacturing and maintenance supplies	2,350,000		1,898,000
Total inventory	127,966,000		121,998,000
Inventory, Real Estate, Held for Development and Sale [Abstract]
Inventory, Real Estate, Held-for-sale	$ 4,900,000		$ 8,300,000

[1] Includes $4.9 million and $8.3 million of HBU real estate held for sale at December 31, 2012 and 2011, respectively.