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Basis of Presentation (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Sep. 30, 2011
Y
segment
plan
Sep. 30, 2010
Basis of Presentation     
High end of the range of the required percentage voting interest held to account for investments with the equity method of accounting   50.00% 
Service sales as a percentage of net sales   less than 1%  
Number of reportable segments prior to the sale of Simpson Dura-Vent Company, Inc.   2 
Number of reportable segments   3 
Reconciliation of basic earnings per share ("EPS") to diluted EPS     
Earnings from continuing operations, net of tax$ 19,380 $ 18,408$ 45,951$ 49,297
Loss from discontinued operations, net of tax  (1,226) (16,212)
Net income available to common stockholders$ 19,380$ (4,499)$ 17,182$ 45,951$ 33,085
Basic weighted average shares outstanding48,253 49,42749,24749,411
Dilutive effect of potential common stock equivalents - stock options (in shares)35 10049137
Diluted weighted average shares outstanding48,288 49,52749,29649,548
Net earnings (loss) per share - basic:     
Continuing operations (in dollars per share)$ 0.40 $ 0.37$ 0.93$ 1.00
Discontinued operations (in dollars per share)  $ (0.02) $ (0.33)
Net income (in dollars per share)$ 0.40 $ 0.35$ 0.93$ 0.67
Net earnings (loss) per share - diluted:     
Continuing operations (in dollars per share)$ 0.40 $ 0.37$ 0.93$ 0.99
Discontinued operations (in dollars per share)  $ (0.02) $ (0.33)
Net income (in dollars per share)$ 0.40 $ 0.35$ 0.93$ 0.67
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive (in shares)1,752 1,0621,746925