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Other Employee Benefit Plans (Details Textual) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Other Employee Benefit Plans (Textual) |  |  |
Percentage of company additional matching contribution to 401(k) plan | 50.00% |  |
Percentage of company matching contribution to 401(K) plan | 100.00% |  |
Defined contribution plan employer matching contribution percent | 3.00% |  |
Company's contributions to 401(K) plan | $ 2,900,000 | $ 2,700,000 | $ 2,300,000
Maximum annual contribution to 401(k) plan by employees, effective January 1, 2013 | $ 17,500 |  |
Percentage of company matching contribution to 401(K) plan, Effective January 1, 2013 | 50.00% |  |
Defined contribution plan employer matching contribution percent, Effective January 1, 2013 | 3.00% |  |
Common stock shares purchase price limit for employees as percentage of market value under Employee Stock Purchase Plan | 90.00% |  |
Purchase limitation of an employee's as percentage of eligible compensation | 10.00% |  |
Maximum number of shares available for purchase by participating employees | 2,500,000 |  |
Minimum [Member] |  |  |
Other Employee Benefit Plans (Textual) |  |  |
Percentage of company additional matching contribution to 401(k) plan | 3.00% |  |
Maximum [Member] |  |  |
Other Employee Benefit Plans (Textual) |  |  |
Percentage of company additional matching contribution to 401(k) plan | 5.00% |  |

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- Definition The amended future percent of the employer's matching of employee deferrals. + References No definition available. + Details
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- Definition Employee stock purchase plan, maximum percentage of purchase an employee can make on eligible compensation. + References No definition available. + Details
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- Definition Employee stock purchase plan, percentage of purchase price from market value. + References No definition available. + Details
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- Definition Maximum number of shares made available for purchase by participating employees under employee stock purchase plan. + References No definition available. + Details
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- Details
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- Definition The additional percent of the employer's matching of employee deferrals. + References No definition available. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -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 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Maximum percentage of employee gross pay, by the terms of the plan, that the employer may contribute to a defined contribution plan. + References No definition available. + Details
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