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Employees' Profit Sharing Plan (Details) (Deferred profit sharing plan, USD $) | 12 Months Ended
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Dec. 31, 2011 Y | Dec. 31, 2010 | Dec. 31, 2009
Deferred profit sharing plan |  |  |
Employees' profit sharing plan |  |  |
Minimum number of continuous employment (in years) | 1 |  |
Profit sharing costs | $ 3,900,000 | $ 4,095,000 | $ 4,366,000

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- Definition The minimum period of continuous employment that the full-time employees are required to perform in order to be participate in the deferred profit sharing plan. + References No definition available. + Details
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