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Related Party Transactions (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 12 Months Ended | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009 | Dec. 31, 2011 Chief Executive Officer | Dec. 31, 2010 Chief Executive Officer | Dec. 31, 2009 Chief Executive Officer | Dec. 31, 2011 Gerald Hagel, vice president and Susan Hagel, spouse Simpson Strong-Tie Y | Dec. 31, 2011 Keymark Enterprises, LLC | Dec. 31, 2010 Keymark Enterprises, LLC | Jan. 31, 2010 Entities related to Keymark Entity | Dec. 31, 2009 Entities related to Keymark Entity | Dec. 31, 2011 Entities related to Keymark | Dec. 31, 2011 Simpson PSB fund
Related Party Transaction |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of use of airplanes | $ 508,000 | $ 532,000 | $ 409,000 | $ 30,000 | $ 30,000 | $ 27,000 |  |  |  |  |  |  |
Lease agreement, extended period (in years) |  |  |  |  |  |  | 5 |  |  |  |  |  |
Annual lease payment to lease the property from Mr. Hagel and his wife Susan Hagel, a former employee of Simpson Strong-Tie | 7,300,000 | 7,100,000 | 6,600,000 |  |  |  | 270,000 |  |  |  |  |  |
Fees for software development |  |  |  |  |  |  |  | 2,500,000 | 800,000 |  |  |  |
Loans made to related parties |  | 1,798,000 | 1,204,000 |  |  |  |  | 600,000 |  | 1,800,000 | 700,000 |  |
Interest rate of loans (as a percent) |  |  |  |  |  |  |  | 7.00% |  | 5.50% | 5.50% | 5.50% |
Number of related entities |  |  |  |  |  |  |  |  |  | 2 | 2 |  |
Ownership interest given up in exchange for software assets acquired (as a percent) |  |  |  |  |  |  |  | 46.10% |  |  |  |  |
Number of shares purchased |  |  |  |  |  |  |  |  |  |  |  |  | 125
Value of shares purchased |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,500,000
Shares purchased, price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.6

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