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Employees' Profit Sharing Plan (Details) (Deferred profit sharing plan, USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Deferred profit sharing plan |  |  |
Employees' profit sharing plan |  |  |
Minimum period of continuous employment to be fully vested | P1Y |  |
Profit sharing costs | $ 3,500,000 | $ 3,400,000 | $ 3,900,000

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- Definition The minimum period that the individual is required to perform services in order to be fully vested under the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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