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Employee Benefit Plans (Details 4) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Deferred Compensation Plan |  |  |
Liabilities, including the Company's common stock | $ 23,893,000 | $ 20,187,000 |
Savings Investment Plan |  |  |
Defined Contribution plans |  |  |
Plan contributions charged to expense | 2,500,000 | 2,000,000 | 2,200,000
Contribution match on portion of employee salary (as a percent) | 6.00% |  |
Discretionary profit sharing contribution Plan |  |  |
Plan contributions charged to expense | 3,900,000 | 3,600,000 | 800,000
Discretionary profit sharing contribution match on portion of employee salary and bonus (as a percent) | 9.00% |  |
Deferred compensation plan |  |  |
Deferred Compensation Plan |  |  |
Market value of the trust assets, excluding the Company's common stock | 10,600,000 | 10,800,000 |
Liabilities, including the Company's common stock | 23,900,000 | 20,200,000 |
Company's common stock held in the rabbi trust | 5,700,000 | 4,900,000 |
Number of common stock deferred into the rabbi trust (in shares) | 267,087 |  |
General and Administrative expense recognized due to increase in the closing price of the Company's shares held in the trust and also due to the sale of shares in the Company's stock | 3,200,000 |  |
Plan contributions charged to expense | $ 661,676 | $ 522,807 | $ 109,196

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- Definition Represents the expense recognized due to increase in the closing price of the entity's shares held in the trust and also due to the sale of shares in the entity's stock. + References No definition available. + Details
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- Definition Aggregate value of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19850-108362 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=6409836&loc=d3e19833-108362 + Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64, 65 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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