Discontinued Operations (Details) (USD $)	12 Months Ended			1 Months Ended	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 31, 2010 Simpson Dura-Vent Company, Inc.	Jun. 30, 2010 Simpson Dura-Vent Company, Inc.
Details related to discontinued operations
Net proceeds received			$ 28,346,000	$ 27,700,000
Results from discontinued operations
Net sales			33,372,000
Cost of sales			28,073,000
Gross profit			5,299,000
Operating expenses			6,683,000
Impairment charge			21,350,000
Loss on sale of discontinued operations			657,000	700,000
Other expenses			28,000
Loss from discontinued operations			(23,419,000)
Benefit from income taxes from discontinued operations			(7,207,000)
Loss from discontinued operations, net of tax			(16,212,000)
Sale of net assets and liabilities of Simpson Dura-Vent, valued at their book value
Accounts receivable				11,925,000
Inventory				18,164,000
Other current assets				30,000
Accounts payable				(436,000)
Other current liabilities				(680,000)
Total net assets sold				29,003,000
Impaired assets consisted of:
Impairment	2,346,000	1,282,000	6,292,000		4,400,000
Intangible assets					1,600,000
Fixed assets	803,000	1,094,000	419,000		10,700,000
Inventory		750,000	5,046,000		3,800,000
Other non-current assets					200,000
Approximate lease revenue per year				900,000
Lease term of entity's facilities in Vacaville				10 years
Professional fees					$ 700,000